2002 Subaru WRX A/C Stops Working

Tiny
RYNN2669
  • MEMBER
  • 2002 SUBARU WRX
  • 4 CYL
  • AWD
  • MANUAL
  • 105,080 MILES
I have a 2002 Subaru WRX Turbo 4cyl and I have had my a/c system checked and tested by my a/c tech at work, we vacumed out the system for about 15 min and there where no leaks or not loosing pressure on the gauges, when we charged the system up the a/c started working and it blows cold air for about 30 seconds and then stops turns to warm air, The high pressure side tube stays cold and and the compressor stays running I dont understand why its not blowing cold air can you help?
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Thursday, July 16th, 2009 AT 9:45 AM

9 Replies

Tiny
DOCFIXIT
  • EXPERT
Hi
yes can help but need the high side and low side readings to diagnose.
Let me know
Thanks for donate
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Thursday, July 16th, 2009 AT 1:25 PM
Tiny
RYNN2669
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Well we tryed again, we evacuated the system, then blew out the entire system and evacuated the system one more time for about 30 minuites. Then recharged it agian, This time the high side was at 100psi when running and the low side about 10 and in about 15seconds it drops its self into a Vacum state low side drops below 0 and the cold air stops blowing, When we turn off the engine it will start going up in psi We are thinking that its the Expantion Valve but not 100% sure on that one, Is there a way to remove it with out taking out the whole dash if it is that problem or no? Thanks for all your help we are dead on Ideas for what is wrong.
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Friday, July 17th, 2009 AT 4:00 AM
Tiny
DOCFIXIT
  • EXPERT
May not have enough refrigerant system need 1.3 to 1.5 lbs. High side at 80 deg ambiant 180 to 200 psi. Low side 35 to 40 psi. Evaporator unit under dash will need to be removed to get at expansion valve.
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Friday, July 17th, 2009 AT 8:51 AM
Tiny
RYNN2669
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Well we did as you said we filled the low side with 40 psi and the high side was reading 200psi. Here is the question when you put the engine up in rpm like to 1500-2000 the low side pressure would drop to about 25psi and then the compressor would shut down cycle and turn back on, Do I need to add more to the low side to keep it going. Took it for a test drive after did all of that and when I started to drive it shut off compleateley was about 101 degrees outside, Tryed it agian when it was about 85 Degrees out side and was able to keep it going all the way home. Tryed it agian and now it will run for about 1 minuite and then turn hot, Compressor still runs and the low side tube turns warm and the hi side stats getting cold. My other question when you are filling the AC unit on the low side are you to keep the bottle uprite to let gas fill the system or turn it upside down for liqued to go into the sytem.
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Saturday, July 18th, 2009 AT 1:48 PM
Tiny
DOCFIXIT
  • EXPERT
Pull car into shade ambient temp 86 to 95. Close all doors place in Recirc mode fan on high. Operate engine at 1500 rpms. Pressure readings should be in this range LOW 18-28 PSI HIGH 213-242 PSI. Get the High side in that range if Low is a little higher say 30psi. That's good. Sounds like you need a touch more charge. Cutting out at 25 is in range of pressure switch let me know where it cuts out exactly.
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Sunday, July 19th, 2009 AT 1:48 PM
Tiny
RYNN2669
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[quote="Docfixit"]Pull car into shade ambient temp 86 to 95. Close all doors place in Recirc mode fan on high. Operate engine at 1500 rpms. Pressure readings should be in this range LOW 18-28 PSI HIGH 213-242 PSI. Get the High side in that range if Low is a little higher say 30psi. That's good. Sounds like you need a touch more charge. Cutting out at 25 is in range of pressure switch let me know where it cuts out exactly.[/Quote

When filling the system do you take the bottle (30lbs) and flip it over for the freon to enter the system or do you leave it uprite and fill with the gas of the freon, My a/c tech does our motorcoachs at work and he fills the system by turning the bottle over so we are trying to make this work, but harder as it goes along.
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Sunday, July 19th, 2009 AT 1:53 PM
Tiny
DOCFIXIT
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I would leave it upright turning over will slug system with liquid and ice up expansion vale and make it impossible to get aproper charge. The bigger motor home system it's O.K. Cause by the distence it would travel it would be a slury mix of gas and liquid.
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Sunday, July 19th, 2009 AT 2:02 PM
Tiny
RYNN2669
  • MEMBER
So, if I evacute the entire system again, and start from scratch, fill the system on the low side only and the high side will gain pressure as well?

If I do so, I fill the system to the numbers you mentioned, and the system should be filled completely?
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Sunday, July 19th, 2009 AT 2:07 PM
Tiny
DOCFIXIT
  • EXPERT
Yes do you have scale for freon? If yes put in 1.5 lbs other wise fill as described. If air temp is higher than 95 will be a slight increase in pressures but fill to thoes pressures.
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Sunday, July 19th, 2009 AT 3:15 PM

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