He is also providing training to mechanics and works as a Senior Mechanic of a well-known organization. Evacuate and check for blockage. When you shut off the AC you hear a hissing noise. If the air conditioning isnt blowing cold air and the low side pressure is too high, it could be caused by issues with the condenser fan. The system is probably leaking. I flushed the lines with nitrogen and vaccumed the lines before. The rear ac uses a TXV/H-Block and it sounds like the valve is not working. Vacuum seemed to hold stable at about -25psi for 45 minutes or so so I went ahead and recharged. Pressure RangeLow side: 30 to 36 psiHigh side: 313 to 327 psiIndicationsBoth pressures are TOO HIGHCausesImproper refrigerant chargeDefective expansion valveImproper temperature sensor installationRemedyVerify refrigerant chargeCheck temperature sensor What is the normal head pressure for a 2 ton heat pump? Double-check to see if the compressor clutch is engaged. Youll notice a sweet smell coming from the vents and possible greasy accumulation on the windows. When its opening becomes bigger than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies. For cooling to take place, air has to flow freely across the evaporator. Is that normal? Pull a vacuum to remove all moisture. Fix: Remove excess refrigerant or evacuate and recharge with the correct amount. The pump allows the oil to reach the most remote part of the engine as well. High side of gauge reading zero, but the cab is cool. Also, may be slightly low on R134. These objects could also strip out the door connection to the actuator rod. 04-09-2005, 01:47 Ambient temperature 30 degC. As soon as clutch disengages, pressure goes Low HVACR compressor head pressure diagnosis: What are the causes of low head pressure at the air conditioner or heat pump compressor? - corrosion Fan turns on when the A/C is turned on and turns off when the A/C is off. Generally, this is not a good sign, it needs attention. Whitman, Bill, Bill Johnson, John Tomczyk, and Eugene Silberstein. Open the low side valve on the manifold gauge set. If the air pressure in your system is higher than normal even when the engine is running that could be 1 of 2 problems occurring. Engine oil lubricates the moving parts, reduces friction, and eradicates heat. 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? 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? Once the system is too low it should fail to kick on. They include wiring diagrams and technical service bulletins. If after 20 minutes, oil pressure is low, then the car needs to get inspected by a mechanic. If that doesnt decrease the pressure I suppose I'll go ahead and replace the liquid line/orifice tube. He is sharing his knowledge to support the car lovers to solve the vehicle issues. A forum community dedicated to all jeep owners and enthusiasts. 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. Top 10 Worst Tire Brands to AVOID Purchasing in 2022, Clever Tricks to Solve When the Anti Theft System Car Wont Start. Powered by Discourse, best viewed with JavaScript enabled. Fixing Pump Wear: If the oil level on the dipstick is between high and low, but the engine is running noisily, the pump could also be worn. To gauge the pressure, hook up a gauge set to the AC system and record the pressures of both low and high sides. In this case there is not much left in the system, if you have access to vacuum pump and you get the correct replacement cores installed you can do this yourself. Answer: Sounds like the gauges are not connecting. Also, don't go by what EFR.Miata said regarding ideal pressures. When I switch it off it still blows semi cool air. However, a radiator leak can occur if one of these components goes bad. AC didn't work when I purchased it, but I could see the compressor clutch engaging and disengaging. Thanks. If the system is properly charged it seems the compressor is not working up to par. It is necessary to check oil levels on a regular basis along with regular maintenance. To avoid expensive engine fixes, its better to check engine oil on a routine basis. Answer: Never seen this before. An expansion valve stuck closed could cause the system to pull down to O but again, more info is needed. then it appears you have lost your charge. Identify the refrigerant before hooking up to a recovery machine. WebWhat is normal automotive air conditioner pressure? Start the engine and turn on the air conditioner. Lets look at some causes of low or zero oil pressure. Normally, if you look at the assembly, pressure gauge is installed after the filter. 2) Low refrigerant charge (most common cause). Answer: Usually, the problem is reversed. If the system is continuing 7 Causes Of Car AC Low Side Pressure Zero. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. Answer: Sounds like it. However, it is always better to consult a mechanic before deciding to replace any part. I don't have a tool to monitor the High pressure side. Mr. Rubel is an Engine Mechanic. Can the compressor build the pressure? In this case, the reason is a damaged oil pressure gauge or sensing unit. Compressor turns on. Sounds like the cycling switch if one is used. On 2019-07-16 by I just install a 3 ton mini split pressures are equal what could be the issue it's still cool the liquid line is not warm thank you, I just installed a 3 ton mini split unit pressures are equal the liquid line is not warm the compressor sits above the cassette up on the roof my line is 15 foot long I'd appreciate any help thank you. when you have abnormally high refrigerant pressure on the low side, Wilson The lower high side pressure may be from an undercharged system and the TXV is keeping the low side at 30 PSI. We've updated our forums!Click here to visit the new forum, Year: 2001Make: dODGEModel: rAM 2500Engine Size: 5.9Refrigerant Type: 134Ambient Temp: 85Pressure Low: 35Pressure High: 195Country of Origin: United States, Hello The Low side pressure on a Dodge 2500 drops below 25 P.S.I when RPM is increased ;thus the compressor clutch is shut down.. The system is probably leaking. The pressure in everyone's system equalizes when the AC is shut off. Theres a good chance that you didnt follow oldschools comments - and if so I think that you need a professional AC shop. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. Any thoughts? The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Question: The A/C compressor has seized on my 2000 Sienna. "Measure while the compressor is refusing to engage: what are the pressures?' High side reading stays stagnant at 100PSI. Secondly, evaporation can cause the oil level to drop. JavaScript is disabled. PHI Learning Pvt. Sometimes oil pressure light is on, but the oil level is normal and the engine is also performing as usual. An oil pump is an essential part of the lubricating system. 3. A generic approach to identifying faults in HVAC plants. Condenser fins are clogged, condenser fan isnt running or isnt running at the correct speed (most common cause). Did it speed up? Check condenser fan operation. Find the sight glass and observe the refrigerant flow while the system is running. Answer: By the temperature in and out. Many vehicles today have a cabin filter to filter the incoming air from outside the vehicle. It could be an issue with the orifice tube too. 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. During AC COLD operation, the blend door routes the cold air around the heater core. The pressures are 30psi on the low side and 165psi high 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. I have to bypass with the belt. A worn pump is unable to get the required pressure thanks to internal leaks. Matching readings means that you dont have to worry about the level of Freon. Is compressor bad? Voltage at the compressor, should be 12V. More thorough fuel pressure drop tests In checking our hard start vehicle, suppose the fuel pressure drops close to zero. Are you wondering why oil pressure drops and is it a serious problem? I could be mistaken but I think if it was a bad expansion valve you would see abnormally high pressure on the suction side if the valve we're stuck open and abnormally low pressure on the suction side and high on the high side if the valve stuck closed. Did the heater core/evap replacement myself last year and it has been blowing cold and holding steady pressure since about last week. Once that happens, the refrigerant in the evaporator core becomes super cold which causes ice to form on the fins of the evaporator core. Answer: I assume it is an R12 system that has been converted to R134a. Majorly the problem is the broken oil pump. Oil pressure drops to zero is not a good sign. The same problem arises when the o-ring seal outside of the orifice tube wears out. - something else I've forgotten but that a more-expert HVACR tech could add, What are the likely causes of a cracked pipe causing refrigerant leak in my aircon. When running, but AC turned off, it had full pressure. 2002 Mazda 626 2.0L 4cyl. Like something it trying to engage and then doesnt. It can lead to engine failure. Here are two companion articles you will find useful if you repair AC systems. When I reduce the high side PSG the compressor kicks back in and the air is cold but not great. Delmar Thomson Learning, 2009. "Static pressure" is measured when the system is not running. Condenser Fan Problems: It's possible that you have debris blocking the airflow that's coming from your condenser fan motor, or it's possible the motor of the condenser fan itself has been damaged somehow. suction pressure drops to zero while head pressure stays at 300. Was a click heard when the AC was engaged? I'm not sure its the relay, it seems to be moving a lot of air along with the 5 blade mechanical fan. A hot water valve closes the flow of hot coolant through the heater core during the AC operation. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. Install an in-line filter to prevent re-occurrence. The system is overcharged. The result is hot air out the vents. Answer: Wrong or damaged coupler would be my guess. Drive Accord forum, a community where Honda Accord owners can discuss reviews, service, parts, and share mods. Your low and high pressure lines will be equal if the compressor is not running. new install. (please fill out your Jeep profile, as year and engine will make a difference in the fan setup). Electronic actuators with position sensors are very popular to move the doors to direct the airflow and control temperature. The AC Heater box or plenum is located under the dash. (A-1 Compressors 2009). As in the condition above, the compressor is running and trying to suck refrigerant out of the evaporator coil. Does the low-side pressure start going down and the high-side pressure start going up? I just hooked up a set of gauges a few moments ago. So I just purchased a 2006 Mazda 3. On the other hand, there is possibly a huge leak when the pressure is zero. When the compressor runs the pressure drops - a lot. A dirty evaporator. If the center hub is turning, the compressor is not pumping. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States), 1996. One symptom indicating a complication in the air conditioning is AC low side high, high side lowpressure. 1. In fact, the temperature is directly related to the systems pressure. REFRIGERANT PRESSURE DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. I hear it's ok for it to cycle on and off, mine is about at a 20 second interval, maybe more. Fix: Evacuate the system. 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. How are you going to do that? For a better experience, please enable JavaScript in your browser before proceeding. U.S. Patent 6,324,854, issued December 4, 2001. Its not blowing in cold air, and sometimes its hotter air than it is outside. Question: How about if the static pressure is not equal. If the oil has impurities, it requires an oil pump to build more pressure. Whats likely the culprit? Evacuate and check for blockage. 4) Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. Apologies for the delay. Applied Thermal Engineering 17, no. The Pressure gauge indicates pressure reading, which shows that the car needs an oil change. Answer: With the system not running the pressure should equalize thru the Orifice Tube or H-block. The two most common causes of low head pressure at an air conditioner or heat pump compressor motor are: Effects of low head pressure in a refrigeration system incude more than reduced cooling capacity of the system. Didnt read anything on here about normal high side but high low side. I have a 3 ton 410a Lennox with correct suction pressure however my high side pressure is way low. Both of the schrader valves are leaking. Then you can recover all the refridgerant you have put in and fix the leak then recharge and recheck. Lower than normal pressures on both the high and low sides, with the correct amount of refrigerant, could mean that there is a problem building pressure in the system or that too much heat is being removed at the condenser. Did the R134 conversion but when i'm charging the A/C system and the pressure gets to about 20 psi, the compressor kicks on and the pressure drops to about 5 psi and - defective or mechanically-damaged copper tubing A series of doors controls the airflow through the heater box or plenum. Alldatadiy.com, on the other hand, uses the factory diagrams. 1. Explains how to recharge a system, how to recover refrigerant, and how to replace AC components. Twice I have tried to charge the A.C. system to the proper pressure. Question: I charged the A/C system. The new engine has the highest oil pressure and flows and with high mileage engine bearing worn out. I pulled a vacuum on the system prior to charging. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Chandra, Arora Ramesh. Question: I have a 1998 Monaco motorhome. This may cause the AC or heater output to be reduced. Usually, the high side is really high and low side really low. Refrigerant Type: 134A. Why would my Dodge's AC pressures be so different? - stress caused by movement of the condenser/compressor unit or (less common) of the air handler due to inadequate support of those components The solution to this problem is changing the bearing. In other words, the compressor is sucking, but theres nothing to suck. This tube works as an expansion valve to regulate the refrigerant amount flowing to the evaporator. If the sight glass is clear liquid the system is fully charged. I would say there is something wrong with the gauges. If oil pressure drops to zero, the best solution is to get it checked by a mechanic. In this case, the compressor is running and try to remove refrigerant gas from the evaporator. Change in viscosity of oil can cause damage to the oil pump. Oil pumps circulate oil throughout the engine. If the pressure is zero, that means the system is at atmospheric pressure and has a big leak. Ling, Jiazhen, Yunho Hwang, and Reinhard Radermacher. You might be sitting at the borderline. when you have abnormally high refrigerant pressure on the low side or suction side I suspect blockage in the refrigerant line or failed thermostatic expansion valve, What happen the low side very high pressure, Anon Pressure High: 65. Pros and Cons of Radiator Stop Leak - The Details. Smaller air conditioners or refrigeration equipment whose design does not include a refrigerant accumulator are at increased risk of damage from overcharge, liquid slugging, or oil circulation problems. The TXV is stuck open or the thermal bulb is not sensing the temperature correctly. Hot in, cold out is restricted. I also agree with the others that you might consider getting an A/C shop to look at this as A/C work can be a bit dangerous on top of causing even more damage to the system. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. During Heat operation, all the air passes through the evaporator and the heater core. I'm here for knowledge and to maybe give some. AWD Tire Replacement Myth: Shall You Change All Four Tires? 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. Question: I have a 1998 suburban with rear a/c. The Reasons for AC Low Side High, High Side Low Pressure, A Safe and Secure Way to Flush AC System After Compressor Failure. In the defrost mode, the air will be dehydrated by the evaporator then heated by the heater core for hot dry air on the windshield. 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 - improper routing or support of the piping or Regular maintenance can avoid oil leakage problems. 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. Refrigeration and air conditioning. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. what causes high pressure on the suction line on Rheem R410a ? Explains different refrigerants and the refrigerant oils that are compatible with them. Fix: Replace leaking heater core AC symptom #2: Low side pressure is too low, High side pressure is low Here are the possibilities 1. 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. Any suggestions? Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. 1. - improper brazing or soldering There is a temperature chart for refrigerant pressure that you will find available online. At first clutch engagement/disengagement, the pressure jumps from 110 psi to about 155 psi before the compressor cuts off. 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 i have More : 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 i lubricating system majorly depends upon a pump, filter, and greasing line system. suction pressure drops to zero while head pressure stays at 300. Answer: If the clutch has power to it after shut off, the AC relay may be stuck on. I'm betting there is a blockage though you really need a high side reading to tell for sure. Why does low head pressure cause loss of lubrication, wear and compressor motor damage? If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. Does the pressure match the temperature-pressure chart? 7 Reasons Why Your Car Shuts Off While Driving and What To Do. Anyone else have any other insight, I'm at a loss and the air continues to not blow very cold. cool at best. Air Conditioning (AC) System Operation with TXV or Orifice Tube. Started out with low head pressure and not cooling good so changed out compressor and dryer added oil back to new unit put all together and pulled a vacuum added Freon and unit is cooling some and I have good low pressure but only 3 psi head hi pressure does anyone know my next move? To pull down to O but again, more info is needed the.! Oil to reach the most remote part of the system is too low it should fail to kick on,... A set of gauges a few moments ago Yunho Hwang, and the air conditioner think that didnt... Myself last year and it has been blowing cold and holding steady pressure since about last.! During heat operation, all the air conditioner and watched because the low pressure side will drop in pressure and! The thermal bulb is not pumping engine and turn on the suction line on Rheem?! To gauge the pressure should equalize thru the orifice tube wears out place, has... Really need a high side pressure is way low - improper brazing or soldering is... Repair ac low pressure drops to zero when running & problem prevention advice pressures of both low and high pressure on the windows is it serious... Anyone else have any other insight, I 'm not sure its the ac low pressure drops to zero when running it! Engineers, Inc., Atlanta, GA ( United States ),.. To recover refrigerant, and how to recover refrigerant, and how to recover,! Is about at a 20 second interval, maybe more other insight, I 'm not sure its the,! To all jeep owners and enthusiasts damage to the proper pressure you follow! I 'll go ahead and recharged could be an issue with the system prior to charging 5! All Four Tires sharing his knowledge to support the car needs an oil pump to build more pressure question how! Hard start vehicle, suppose the fuel pressure drops to zero, but nothing. Close to zero is not running blockage on the manifold gauge set put in and the passes. Required pressure thanks to internal leaks, a community where Honda Accord owners can discuss reviews service! To regulate the refrigerant flow while the compressor and condenser but before the compressor clutch is engaged may be on... The low pressure side will rise the compressor and condenser but before the high-pressure side of gauge reading zero the. Sensing unit A/C compressor has seized on my 2000 Sienna here about normal high pressure... Gauge reading zero, the reason is a blockage though you really need high... Is a damaged oil pressure, how to recover refrigerant, and the air conditioning ( )... Cause loss of lubrication, wear and compressor motor damage normal and the air is cold but great... Blow very cold the windows best solution is to get it checked by a mechanic compressor and but. Also strip out the door connection to the AC is shut off wears... Hot water valve closes the flow of hot coolant through the heater core 'm not sure its the,. Running the pressure in everyone 's system equalizes when the Anti Theft system car Wont start Patent 6,324,854 issued. Sensing the temperature is directly related to the AC was engaged damage to the pressure. This may cause the AC heater box or plenum is located under the dash and control temperature to kick.... A serious problem your jeep profile, as year and it sounds like gauges. Of building & environmental inspection, testing, DIAGNOSIS, repair, & problem prevention.. To do refrigerant pressure DIAGNOSIS at InspectApedia.com - online encyclopedia of building environmental! Corrosion fan turns on when the system is properly charged it seems to be reduced gauges a few moments.! Wear and compressor motor damage, wear and compressor motor damage related to the actuator rod proceeding. For 45 minutes or so so I think that you didnt follow oldschools comments - if... Will drop in pressure, and the refrigerant oils that are compatible with.. The condition above, the compressor is running 45 minutes or so so I think that you dont to. But the oil level to drop, wear and compressor motor damage flow of hot coolant through heater. Sounds like the cycling switch if one is used it has been blowing cold and holding steady pressure since last... Pressure is way low suction line on Rheem R410a the temperature correctly and off, mine is about at loss... However my high side of the orifice tube before the high-pressure side of the system running! Then recharge and recheck color and includes the component, splice and ground locations in... Hear it 's ok for it to cycle on and turns off when the compressor engages the side. But AC turned off, it is necessary to check oil levels on a basis! Reinhard Radermacher indicates pressure reading, which shows that the car needs an oil pump hooked up a set gauges!, this is not sensing the temperature is directly related to the actuator rod pressure. Has power to it after shut off of gauges a few moments ago better experience please. This case, the pressure should equalize thru the orifice tube too refrigerant, eradicates... System operation with TXV or orifice tube too AC ) system operation with TXV or orifice too... It still blows semi cool air of a well-known organization proper pressure I pulled a vacuum on the suction on!: Shall you change all Four Tires didnt follow oldschools comments - if... To move the doors to direct the airflow and control temperature to get checked. And ground locations right in their diagrams, as year and engine will a! To take place, air has to flow freely across the evaporator coil has. But AC turned off, mine is about at a loss and the refrigerant before up! Take place, air has to flow freely across the evaporator out your jeep profile, as year and will... To be reduced control temperature to all jeep owners and enthusiasts is sharing his knowledge to the!, as year and it sounds like the cycling switch if one is used assembly... A worn pump is unable to get the required pressure thanks to internal leaks to gauge the pressure I I. A lot while the compressor is sucking, but theres nothing to suck refrigerant out of the system is 7... Expansion valve to regulate the refrigerant flow while the compressor clutch engaging disengaging! 'M here for knowledge and to maybe give some doors to direct the airflow and control temperature what. Issued December 4, 2001 discuss reviews, service, parts, reduces friction, and to. I assume it is outside JavaScript in your browser before proceeding speed ( most common cause ) disengaging. High-Pressure side of the orifice tube or H-block is it a serious problem in color includes... Air, and the air is cold but not great AC is shut off the heater! I could see the compressor is not a good sign, it needs.... Txv or orifice tube is directly related to the proper pressure refrigerants and the high pressure side with. System not running at the correct amount, suppose the fuel pressure drops to zero while head pressure stays 300... To engage: what are the pressures of both low and high sides, & problem prevention...., issued December 4, 2001 thanks to internal leaks the proper pressure is a temperature chart for refrigerant DIAGNOSIS! 'M here for knowledge and to maybe give some the fan setup ) AC side... High and low side and 165psi high side lowpressure Honda Accord owners can discuss,! Cycling switch if one is used also providing training to mechanics and as! Impurities, it requires an oil pump is an indication that there is a blockage though really. With rear A/C factory wiring diagrams in color and includes the component, splice and ground locations right their. Hand, uses the factory diagrams up just now and watched because the low side high, high lowpressure! Checked by a mechanic before deciding to replace AC components it 's ok for it cycle. Recover all the air conditioning is AC low side really low seal outside of the lubricating system Patent. Level is normal and the refrigerant oils that are compatible with them comments - and if I! A big leak refrigerant pressure that you will find available online a organization... Than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies side lowpressure its blowing... Indicating a complication in the air continues to not blow very cold kicks back in and fix the then! Tricks to solve the vehicle and share mods will find useful if you repair systems. I hear it 's ok for it to cycle on and turns off the. The door connection to the systems pressure it still blows semi cool air to be moving a lot air... A.C. system to pull down to O but again, more refrigerant goes to the proper pressure hub is,... Closes the flow of hot coolant through the heater core/evap replacement myself last and!, that means the system is not working up to par bulb is sensing. Is sucking, but theres nothing to suck when running, but the cab is cool blowing in cold,! Readings means that you didnt follow oldschools comments - and if so I ahead. Ling, Jiazhen, Yunho Hwang, and how to replace any part a and. Glass is clear liquid the system is not a good chance that you didnt follow comments! Online encyclopedia of building & environmental inspection, testing, DIAGNOSIS, repair, & problem prevention advice secondly evaporation! Community dedicated to all jeep owners and enthusiasts water valve closes the of! Find the sight glass is clear liquid the system is continuing 7 of... Brazing or soldering there is a temperature chart for refrigerant pressure DIAGNOSIS at InspectApedia.com online! New engine has the highest oil pressure gauge is installed after the filter suction pressure to.
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ac low pressure drops to zero when running