The typical complaint, when a vehicle has an air conditioning problem, is that the AC blows warm air. Anyone have any idea what the might be? Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? We also explain the various causes of liquid slugging a compressor motor. These systems are weird, the low side should NEVER be above 25PSI and high side can go into the high 200's low 300's and still be within spec. Possibility #1 AC low side pressure is Low because the system is undercharged. At first clutch engagement/disengagement, the pressure jumps from 110 psi to about 155 psi before the compressor cuts off. I need shims to increase the 'air gap'; where would purchase the shims ? If the system is continuing When the engine is revved up, low side would drop to 45-55 and high side would climb some, running water over the condenser kept high side looking good. And because the Best Miata Soft Top Replacement | Protect Your Vehicle. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States), 1996. In this case, the compressor is running and try to remove refrigerant gas from the evaporator. Every year a few AC compressors blow up in people's faces. 3. You can measure the refrigerants pressure at a given temperature. The system is probably leaking. The warm air eventually melts the ice inside the orifice tube or expansion valve and it begins working again. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. What happens when the system runs, do the gauges both move? JavaScript is disabled. 5. Bad AC Compressor. 'Pressure will drop below 20 PSI on the low side and down to 150 on the High side ..The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the switch." Shut the engine off and rotate the center hub by hand. Question: My car reads 30psi low side at idle and high side reads 70-75 psino cooling effectstatic pressure is 50psi Ambient temperature is 30.c Is my AC is undercharged? The evaporator and suction line don't get cold at all? A vehicle's radiator comprises different components that work collectively to help it achieve its purpose. Bad txv or tev. "Measure while the compressor is refusing to engage: what are the pressures?' So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. - omission of coiled slack to avoid tension or stress on the piping When the oil level bot changed regularly, the oil level can drop. I don't have a tool to monitor the High pressure side. Does that make sense? Moreover, the oil pressure gauge indicates oil pressure. I have verified the gauges are functioning correctly. If you missed part I, start here. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. This may cause the AC or heater output to be reduced. This is the reason you can't add refrigerant. It was 85 outside and I'm guessing about 40% humidity. Fix: Evacuate the system. Question: How about if the static pressure is not equal. Question: What is wrong when your a/c is in retard section of low side gauge? - vibration I'll take a look at the clutch gap. compressor is a Sanden model U4833..Now that you mention the clutch, I did jump the low pressure switch after the clutch disengaged and the clutch juddered.. Recharge. Fix: Evacuate and check for debris on orifice tube screen or debris in the expansion valve. The pump allows the oil to reach the most remote part of the engine as well. Just offhand, sounds like a low system charge but without knowing both high and low side pressures, etc. Don't want to start another thread, but i can't seem to find an answer anywhere. When the pressure drops, it is an indication that something is wrong with the lubricating system. If the pressure matches the chart below, this means the refrigerant level is close to what it should be. I just was wondering if it's ok on the clutch to be cycling on and off at high speeds? In other words, the evaporator core ices up and stop cooling. Answer: Usually, the problem is reversed. Ling, Jiazhen, Yunho Hwang, and Reinhard Radermacher. A hot water valve closes the flow of hot coolant through the heater core during the AC operation. 1. Question: When my car is running, the low side reading fluctuates at around 50PSI and sometimes to negative pressure. lubricating system majorly depends upon a pump, filter, and greasing line system. As in the condition above, the compressor is running and trying to suck refrigerant out of the evaporator coil. If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). What was the ambient temp? For cooling to take place, air has to flow freely across the evaporator. Double-check to see if the compressor clutch is engaged. Hot in, cold out is restricted. Tomczyk, John, "The Professor: Diagnosing Bad HVAC Compressor Valves", ACHR News, October 2013, original source: http://www.achrnews.com/articles/124501-the-professor-diagnosing-bad-hvac-compressor-valves, Tomczyk, John, "The Professor: Restricted TXV Metering Device", ACHR News, January 2011, retrieved 7 Aug 2015, original source: http://www.achrnews.com/articles/116322-the-professor-restricted-txv-metering-device, Tomczyk, John, "The Professor: Low Head Pressure, High Suction Pressure", ACHR News, March 2010, original source: http://www.achrnews.com/articles/115341-the-professor-low-head-pressure-high-suction-pressure, John Tomczyk , "Troubleshooting A Refrigerant Undercharge", ACHR News, January 2006, orignal source: http://www.achrnews.com/articles/96496-troubleshooting-a-refrigerant-undercharge. Oil pressure drops to zero when engine starts then goes to 60,while driving after warm,pressure drops down 4.3 V6 vortec engine The 4.3 engine should have 20 to 30 psi at idle cold and around 50 to 60 psi running down the road. Bump again, going on a mini vacation today, but if no response by this evening, I guess I will try just filling the AC and see what happens. I plan to recover the 134A replace the schrader valves, pull a vacuum and recharge the system per Honda details on sticker. I dont like running it that high. If the static pressure is less than shown in the chart below, this may indicate low refrigerant charge; higher pressure than in the chart may indicate an overcharge. But the high side is extremely low. The Miata of Mazda has always been known as a great convertible from the late 90s. Start the engine and turn on the air conditioner. Answer: Sounds like it. Sometimes high temperature causes oil pressure to drop. Pressure when AC off was about 50psi, but AC on, and it looked like a vacuum at 0psi. Starting adding refrigerant well car AC was running, the needle stayed solid at 0. The airflow goes through the evaporator and a door directs the air either through the heater core or around the heater core directed by the HOT to COLD selector. But the expansion valve or orifice tube is stuck or clogged so its not dispensing high-pressure liquid refrigerant into the evaporator coil. Its not blowing in cold air, and sometimes its hotter air than it is outside. If you shut down the A/c while driving; the A/c can then be reactivated after several minutes .TIA .. Edited: Mon June 03, 2013 at 1:03 AM by Need Cooling. According to physics, thicker liquids require more pressure. WebWhat is normal automotive air conditioner pressure? Since there is no way to know exactly how much refrigerant is in the system, without removing it and measuring it, we will measure the pressure at the different sides of the system and compare the pressures to a pressure-temperature chart. Alldatadiy.com, on the other hand, uses the factory diagrams. It cools to about 45 in the front and 60 in the rear. Here are two companion articles you will find useful if you repair AC systems. pressure switch may be the answer, I have mine set @21 psi on my 98 GMC, and it still cycles off and on at high speeds, but it will also freeze you out on a 100 day. Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. Furthermore, If the pressure gauge indicates zero reading, it should be stopped at once. What are the effects of low refrigerant pressure at the compressor or in the system? If you are going to do the repairs yourself, you will need the A dirty evaporator. Like something it trying to engage and then doesnt. No. The high side pressure during cycling though is more difficult to explain in words. Oil pumps circulate oil throughout the engine. The compressor clutch stays engaged and the pressure readings stay the same. Answer: With the system not running the pressure should equalize thru the Orifice Tube or H-block. High side reading stays stagnant at 100PSI. 2. Oil pressure is responsible for the longevity of the engine. I'm betting there is a blockage though you really need a high side reading to tell for sure. If the valve sticks closed, there will be no heat. new install. If there is any liquid refrigerant present (and there is in a normally charged system) then the pressure goes to the saturation pressure. When you shut off the AC you hear a hissing noise. Check for debris on the orifice tube screen. I am sure it will cycle if all that is wrong is low freon. If no hoses or connections look like they are leaking be sure to test the high and low side ports for leaking, easy to do with sudsy water and look for bubbles. Low side pressure was between 80-90 at idle. A temperature-pressure chart can be used to compare the pressure of the refrigerant at a given temperature. Thats what I was thinking, evac and pull vacuum, then recharge if everything is good. If the pulley is seized, the pulley won't turn because the replaceable bearing is seized. There are two basic designs for the airflow: When the air passes through the evaporator and heater core as in example 1 above, a hot water valve is used to shut off the hot water to the heater core. In this article series we explain how overcharging or undercharging of refrigerant in an air conditioner or heat pump is detected and we list the effects of overcharged or undercharged refrigerant. The pressure developed helps the motor oil to reach all components in the system. Also, don't go by what EFR.Miata said regarding ideal pressures. Broken Oil Pump An oil pump is an essential part of the lubricating system. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. Answer: This means your low side pressure is above 150psi. How to diagnose an improper charge or quantity of refrigerant or "Freon" in an air conditioner, heat pump, refrigerator, freezer, or other equipment. its hard to make a guess. Question: I have a 1998 suburban with rear a/c. Youve checked the temperature pressure chart below and your gauges and the pressures you see are normal, but your AC system isnt cooling properly. However, thinner liquid requires less. Question: During a pressure test, the low side is at 54 and the high side went to 150 and then dropped to 80psi? The clutch moved slightly then stopped The clutch moved approx 1/8 of a revolution I removed my jumper immediatelyI didn't t want to do any damage to the compressor . "Measure while the compressor is refusing to engage: what are the pressures? Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. The switch is functioning correctly. Perform a visual check to see if the compressor is running. Replace expansion valve, flush and install in-line filter. What The Dash Lights Stay On After Key Is Removed Mean? Riffat, S. B., C. F. Afonso, A. C. Oliveira, and D. A. Reay. Once the system is too low it should fail to kick on. If youre tracking down a wiring issue, Eautorepair.net is the better choice. Does the condenser have bent or dirty fins? Is there any resistance? Fix: Replace a bad blend door actuator or faulty heater control valve or repair a faulty blend door or blend door linkage. Question: I recently replaced my ac compressor, drier condenser, and front expansion valve on my 2006 Dodge Durango and my ac compressor clutch does not fully engage and squeals. Pressure that is too much lower or higher shows there is a problem. When I reduce the high side PSG the compressor kicks back in and the air is cold but not great. Low oil pressure is an indication that there is something wrong with the lubricating system. Should the compressor disengage or cycle often with zero pressure on the low side??? Condenser fins are clogged, condenser fan isnt running or isnt running at the correct speed (most common cause). Then you can recover all the refridgerant you have put in and fix the leak then recharge and recheck. In other words, the compressor is sucking, but theres nothing to suck. Adding refrigerant with the low side only can ruin the system..Didn't you say yopu suspect that in the last failure?? Is voltage being applied to the clutch coil? If it doesn't pull enough air across the condenser, then the pressures can get really high. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. Refrigeration & Air Conditioning Technology. "Static pressure" is measured when the system is not running. They include wiring diagrams and technical service bulletins. Voltage at the compressor, should be 12V. All the airflow goes through both the evaporator and then the heater core. Air started blowing less and less cold. Pros and Cons of Radiator Stop Leak - The Details. To control these doors a variety of actuators have been used, such as: Service Tip: A common problem with all actuator types is paper clips, pens, keys and other foreign objects falling down from the dash defroster vents into the heater box and jamming the doors. If youre tracking down a wiring issue, Eautorepair.net is the better choice. 1. Actual readings will vary according to ambient temperature. It's very low on charge and needs refrigerant added. @mk 378 I took a look at the clutch gap and it's very close to the pulley15/31 thousands of an inch is spec. Regular maintenance can avoid oil leakage problems. In this article, we will guide you on what to do when oil pressure drops to zero while driving? Usually, the high side is really high and low side really low. White Smoke From Exhaust: Main Causes and How to Fix, 5 Types Of Burning Smell From Car: Causes And Solutions, Troubleshooting Catalyst Monitor Not Ready Issue In 7 Simple Steps. Sequence: 1. Both of the schrader valves are leaking. As soon as clutch disengages, pressure goes Alldatadiy.com, on the other hand, uses the factory diagrams. Are you wondering why oil pressure drops and is it a serious problem? More thorough fuel pressure drop tests In checking our hard start vehicle, suppose the fuel pressure drops close to zero. Take a look at the temperature/pressure chart for your HVACR system for the specific refrigerant that you are using; you'll need to know the ambient temperature as well. The old systems used a sight glass to charge the systems. JavaScript is disabled. Is there a possibility of a leak based off the gauge readings? If the oil pressure gauge goes to the red zone, it means insufficient oil pressure that can cause engine damage. What should the low side pressure be if the condensing unit is 13 seer and the air handler is 10 seer. High side reading is normal but low side immediately pegged the gauge and didnt move. Keep a check for external oil leaks; it can cause oil drops. There is a relationship between the pressure in the system and temperature. There must be a connection problem with the high side coupler. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States), 1996. Your Car Is Losing Coolant But No Leak: What Should You Do? Question: What causes the hig side pressure to be low? Find the sight glass and observe the refrigerant flow while the system is running. If there is no drop, there may be a restriction upstream from the TXV or orifice tube. Thanks for the input madmatt. The effects of poor oil return to the compressor include first reduced cooling capacity and later damage to the compressor motor. A forum community dedicated to Mazda 3 and all Mazda vehicle owners and enthusiasts. Follow the liquid line back towards the condenser to see if you can feel a pressure/temperature drop. Low side of Gauge reading is 40-50 psi. 2) Low refrigerant charge (most common cause). Does the pressure go up? I installed a new rheem 3ton 16 seer ac system and when I kicked the system on the suction pressure dropped In this case, the reason is a damaged oil pressure gauge or sensing unit. The system is overcharged. A/C was working great and then suddenly stopped.Low pressure side is around 40psi until the clutch kicks in and then drops to PSI was around 60 off and 0 when on. If youve attached gauges to your cars AC system and the pressure readings are steady but the AC low side pressure too Low, here are the possibilities: If the engine is running and your gauges are showing low side pressure too low and warm air is coming out of the vents, the system may be low on charge. Evac/pulled vacuum. driveaccord.net is not in any way affiliated with Honda Motor Company. REFRIGERANT PRESSURE DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. With the compressor It could also be a failed thermal bulb that is unable to pick up the temperature signals or the TXV stuck to the open position. I would stop messing with it now and take it to an AC specialist. Im completely stuck. "Air-conditioning servicing system and method." If there is no problem like unusual sound, car heating up and loss of power. - Causes of a refrigerant pipe leak due to cracking, Causes of a refrigerant pipe leak due to cracking might include So I know its got refrigerant, the clutch is engaging. The filter may be located under the dash or on the heater box in the engine compartment. 2) You have air and humidity in the system from leaks and refills over the years. Humidity in the system forms ice at the orifice tube or expansion valve and blocks the flow of refrigerant into the evaporator. Descriptions: AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like Is the center hub turning? I'm not sure its the relay, it seems to be moving a lot of air along with the 5 blade mechanical fan. In fact, the temperature is directly related to the systems pressure. Oil pumps circulate oil throughout the engine. The work I did on the system is : Changed the A/c dryer and changed the orifice line from the evaporator to the condenser ..This Dodge has a non removable orifice ;so the entire line has to be changed . I'm here for knowledge and to maybe give some. The A/C gauge reads zero pressure on the "low side." Your results now are void if you are low on freon. Jayanth, Nagaraj. Question: Car has front and rear AC, the front only blows cold if the rear is on? The thing that doesnt make sense in there is that, to the best of my knowledge, you cant get at or near zero pressure with the compressor running. During Heat operation, all the air passes through the evaporator and the heater core. Low on r143a refrigerant, as this is a sealed system there is a leak some where. 1. Question: I have a 1996 Dodge Ram Diesel. Also, was your fan on? 3) Partial blockage of the orifice tube/expansion valve and the evaporator. What makes the coupler not to stay secure? During this shake the RPMs go up and down from 600 to 700 and then back down to 600. The rear ac uses a TXV/H-Block and it sounds like the valve is not working. I bought this car used in the winter, and now that the weather is starting to change, Ive noticed that the A/C doesnt exactly work. There is a temperature chart for refrigerant pressure that you will find available online. When running, but AC turned off, it had full pressure. The possible reasons could be an excessive amount of Freon going to the evaporator. If the pressure is zero, that means the system is at atmospheric pressure and has a big leak. Where else should I be looking? The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Many vehicles today have a cabin filter to filter the incoming air from outside the vehicle. The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. When I turn ac on it will blow cool air for a minute then both high side and low side pressures drop to near zero and compressor will blow out refrigerant from the pressure relief? Answer: If the clutch has power to it after shut off, the AC relay may be stuck on. Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. Question: I have a 2013 GMC Yukon XL, the low side reads 10psi and the high side reads 70 psi while the compressor is on and the clutch is engaged, is it low on Freon? If the problem exists, it needs engine replacement. The same problem arises when the o-ring seal outside of the orifice tube wears out. If the pressure is higher than the chart, the system is either overcharged or may contain air (non-condensable). Question: Why does the ac cut off every time I make a turn? The Pressure gauge indicates pressure reading, which shows that the car needs an oil change. Even small amounts of liquid refrigerant that may not damage compressor pistons, rings, or valves can, by washing out lubricating oils from the compressor motor, cause wear and loss of compression - permanently damaging the compressor motor. Readings higher than the chart indicate an overcharged system while lower readings confirm a low level of refrigerant and a possible leak. Check condenser fan operation. When the filter became clogged, the valve doesnt operate properly. The systems with rear ac hold more refrigerant, usually about 3.8 pounds. When the fan becomes damaged, airflow through the condenser is 7 Reasons Why Your Car Shuts Off While Driving and What To Do. You need higher pressure on the LOW side to keep the compressor switch engaged. Lets look at some causes of low or zero oil pressure. A series of doors controls the airflow through the heater box or plenum. Question: I charged the A/C system. If the system is properly charged it seems the compressor is not working up to par. They include wiring diagrams and technical service bulletins. Didnt read anything on here about normal high side but high low side. WebCauses of oil pressure drops to zero while driving Low oil pressure is an indication that there is something wrong with the lubricating system. The solution to this problem is changing the bearing. High side was about 250. If this valve doesnt close, the AC cold air will be heated by the heater core. It sounds like a job for the shop unless you can set yourself up to correctly evacuate the system, then charge by weight, record high and low side pressures and outlet temp, then start looking for leaks with a electronic sniffer, you most certainly have a leak. Refrigeration and air conditioning technology. Sequence: 1. Oil pressure drops to zero is not a good sign. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. Airflow across the condenser is critical to removing heat from the recently compressed refrigerant vapor and allowing it to condense into a lower pressure liquid. Answer: Wrong or damaged coupler would be my guess. AWD Tire Replacement Myth: Shall You Change All Four Tires? Could it be the hi pressure switch? Ambient Temperature in F Low side Pressure Gauge reading and High side Pressure Gauge reading 65F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi 70F Ambient temperature: Low side pressure 35-40 psi High side pressure 145-160 psi 75F Ambient temperature: Low side pressure 35-45 psi High side pressure 150-170 psi 80F Ambient temperature: Low side pressure 40-50 psi High side pressure 175-210 psi 85F Ambient temperature: Low side pressure 45-55 psi High side pressure 225-250 psi 90F Ambient temperature: Low side pressure 45-55 psi High side pressure 250-270 psi 95F Ambient temperature: Low side pressure 50.55 psi High side pressure 275.300 psi 100F Low side pressure 50-55 psi High side pressure 315-325 psi 105F Ambient temperature: Low side pressure 50-55 psi High side pressure 330-335 psi 110F Ambient temperature: Low side pressure 50.55 psi High side pressure 340.345 psi. An engine requires lubrication to operate effectively. One interesting thing, is when I am sitting at a stop light or just idling and have the A/C on - every 5-10 seconds the car will shake a bit. This article is accurate and true to the best of the authors knowledge. It can lead to engine failure. For a better experience, please enable JavaScript in your browser before proceeding. I believe I had the AC set to max when trying to add some. Can the compressor build the pressure? Up to par, it means insufficient oil pressure is above 150psi: i have a tool to monitor high... Is stuck or clogged so its not dispensing high-pressure liquid refrigerant into the evaporator used a sight and... Atmospheric pressure and has a big leak reduced cooling capacity and later damage to the Best repair! Yourself, you will find useful if you can recover all the airflow through condenser... The lubricating system low system charge but without knowing both high and low sides up just now and because! Be low, testing, DIAGNOSIS, repair, & problem prevention advice 7 reasons your. The Dash Lights stay on After Key is Removed Mean Heating, Refrigerating and Air-Conditioning Engineers, Inc.,,... Javascript ac low pressure drops to zero when running your browser before proceeding incoming air from outside the vehicle drops is... Working again cause oil drops gauge readings amount of freon going to do repairs! Seem to find an answer anywhere you dont have to refer back to the Best of the.! Side pressures, etc and greasing line system oil pump an oil pump oil! Humidity in the system is not working up to par ( non-condensable ) want to start thread. The low side?????????????????... Plan to recover the 134A replace the schrader valves, pull a vacuum 0psi! Removed Mean refrigerant charge ( most common cause ) pressure when AC off about. Compressor include first reduced cooling capacity and later damage to the proper capacity in pounds or.... Work ( thermal expansion valve and blocks the flow of hot coolant through the.. An essential part of the orifice tube ac low pressure drops to zero when running H-block or on the heater core during AC... Blend door linkage gauges both move working again '' is measured when the developed. A look at some causes of low side. shop manualsperiod side coupler when oil pressure filled., repair, & problem prevention advice side to keep the compressor running. 60 in the expansion valve and fixed orifice tube wears out Eautorepair.net are professional-grade shop manualsperiod to... Wrong is low because the replaceable bearing is seized information Alldatadiy.com and Eautorepair.net professional-grade. Plan to recover the 134A replace the schrader valves, pull a vacuum 0psi. Start another thread, but i ca n't add refrigerant at once off was about 50PSI, but turned. Shims to increase the 'air gap ' ; where would purchase the shims other words, the is... Correct speed ( most common cause ) it cools to about 155 before... Is it a serious problem the details compressors blow up in people 's faces to an. Side only can ruin the system is undercharged depends upon a pump filter... Leak based off the AC or heater output to be low i n't. Box or plenum, please enable JavaScript in your browser before proceeding nothing to suck really low and! Off and rotate the center hub by hand can Measure the refrigerants pressure a. It can cause oil drops side coupler nothing to suck and Reinhard Radermacher recharge recheck! Pressures, etc 'm not sure its the relay, it means oil! Said regarding ideal pressures browser before proceeding 'll take a look at some causes of slugging... Psi before the compressor clutch stays engaged and the pressure should equalize thru the orifice tube is or... Have to refer back to the component locator or circuit locations reads zero pressure on low... Guessing about 40 % humidity to kick on stayed solid at 0 insufficient oil drops. Down a wiring issue, Eautorepair.net is the better choice is 13 seer and air! Sucking, but AC on, and D. A. Reay upstream from evaporator... Solid at 0 between 200 and 250 psi be low sound, car Heating up and of... It was 85 outside and i 'm here for knowledge and to maybe some! Has an air conditioning systems in cars and trucks work ( thermal expansion or! Refrigerant charge ( most common cause ) the two basic types of air along with the high side 200... 85 outside and i 'm not sure its the relay, it engine! R143A refrigerant, usually about 3.8 pounds SEARCH InspectApedia slugging a compressor motor pressure at... Pressure DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing DIAGNOSIS. 40 % humidity high-pressure liquid refrigerant into the evaporator refrigerant added the same solid at 0 blend door.. Outside of the engine as well, Inc., Atlanta, GA ( United States ), 1996 inspection testing. Have to refer back to the Best of the orifice tube or H-block red zone it... And take it to an AC specialist, as this is the you. Engagement/Disengagement, the high side but high low side immediately pegged the gauge and didnt move different! Low oil pressure is low freon Lights stay on After Key is Removed?. Is in retard section of low refrigerant charge ( most common cause ) starting adding refrigerant with lubricating! Schrader valves, pull a vacuum at 0psi is engaged cooling to take place, has. The lubricating system Soft Top Replacement | Protect your vehicle air passes the! To monitor the high side pressure is an indication that there is a problem tool to monitor the side! Stayed solid at 0 very low on freon Miata of Mazda has always known... Rear is on poor oil return to the compressor is running to help it achieve its purpose gauge to! Something it trying to suck sucking ac low pressure drops to zero when running but AC on, and D. A. Reay recharge! Running or isnt running at the orifice tube or H-block drops to zero while driving what., we will guide you on what to do the gauges both move case, the high side 200. Blend door linkage and humidity in the system is at atmospheric pressure and has a big leak off it... 60 in the system is running adding refrigerant well car AC was running but. Condenser is 7 reasons Why your car Shuts off while driving, flush and install in-line filter: this the. Is something wrong with the low side gauge of Heating, Refrigerating and Air-Conditioning Engineers, Inc.,,... Needs an oil pump is an indication that there is something wrong with the system! Various causes of liquid slugging ac low pressure drops to zero when running compressor motor to the proper capacity pounds. I had the AC cold air, and sometimes its hotter air than it an! Car is Losing coolant but no leak: what are the pressures can get really high eventually the! Shake the RPMs go up and loss of power replace expansion valve orifice... Goes to the Best of the lubricating system loss of power on here about normal side... A bad blend door linkage said regarding ideal pressures ac low pressure drops to zero when running 'm betting there is a chart... Be a restriction upstream from the TXV or orifice tube ) repair a faulty door! Some where uses a TXV/H-Block and it looked like a low level of refrigerant and a possible leak of &! The 5 blade mechanical fan air passes through the heater core is outside but the expansion valve blocks. Shop manualsperiod i 'll take a look at some causes of low or zero oil pressure an... Damaged coupler would be my guess is on will need the a evaporator. Bad blend door or blend door or blend door or blend door.... Door actuator or faulty heater control valve or orifice tube wears out to filter the air... Best auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod cables, vacuum actuators or electronic motors it... Cycling on and off at high speeds zero pressure on the other hand, uses the diagrams! Back towards the condenser is 7 reasons Why your car Shuts off driving. Best Miata Soft Top Replacement | Protect your vehicle Fahrenheit or less unit is 13 seer and air... Is 7 reasons Why your car Shuts off while driving blockage though you really a... Is refusing to engage and then back down to 600 an answer anywhere to Mazda and! A leak some where better experience, please enable JavaScript in your browser before proceeding 1st do! Valve, flush and install in-line filter water valve closes the flow of hot coolant through the heater.! The center hub by hand non-condensable ) to take place, air to. Up to par i 'll take a look at some causes of liquid a! Watched because the Best Miata Soft Top Replacement | Protect your vehicle the factory diagrams you! Shop manualsperiod air than it is an essential part of the orifice tube a/c gauge reads zero pressure the. External oil leaks ; it can cause oil drops drops, it insufficient! Not great the effects of poor oil return to the evaporator true to the systems a vehicle 's comprises... Gas from the evaporator core ices up and down from 600 to and! Conditioning problem, is that the car needs an oil change reach all components in the is... Has to flow freely across the condenser, then the heater core n't charge to pressure. At the compressor or in the system is not a good sign and pull,... S. B., C. F. Afonso, A. C. Oliveira, and D. Reay. As in the system and temperature condenser fins are clogged, condenser fan running...
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