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compressor issues

tommystunes on Wed July 29, 2009 5:12 PM User is offlineView users profile

Year: 2003
Make: volkswagen
Model: jetta
Engine Size: 1.9 tdi
Refrigerant Type: 134
Ambient Temp: 100
Country of Origin: United States

New Member here... 2003 jetta diesel.radiator fans work properly,compressor turns on, puts out cold air.When I tested pressures,20 psi low side/250 psi high side. A/C will work fine for a while then blow "slightly cooled "air ,eventually ambient. When this happens, the low side is slowly fluctuating between 20 and 30 PSI.The blower speed seems to have an effect on how long it will blow cold. On high it works longer than when on low. When you turn the A/C switch off then on ,sometimes it will work again for a short time. Any suggestions?

TRB on Wed July 29, 2009 5:15 PM User is offlineView users profile

Do you lose air volume also?

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tommystunes on Wed July 29, 2009 5:33 PM User is offlineView users profile

not noticeably

mk378 on Thu July 30, 2009 1:52 PM User is offline

Does the low side line under the hood stay cold, or does it also warm up?

Line stays cold, or gets icy: evaporator freeze-up or reheating from the heater. Variable compressor systems can freeze up because there is air in the refrigerant.

Line gets warm: probably balky TXV, or water freezing in the TXV.

tommystunes on Thu July 30, 2009 2:34 PM User is offlineView users profile

line is just cool. most definitive answer yet,thanks

tommystunes on Thu July 30, 2009 2:34 PM User is offlineView users profile

anyone else??

dasinc on Thu July 30, 2009 3:03 PM User is offlineView users profile

When it starts warming up what happens to your high side pressure?

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Take care,

Travis

[email protected]

tommystunes on Thu July 30, 2009 3:24 PM User is offlineView users profile

I did not check (I know,incomplete testing) .The high side connector lost one of the balls and had to be held on,.

dasinc on Thu July 30, 2009 3:40 PM User is offlineView users profile

It would be helpful to know that. Although your low side doesn't suggest it, if your high side is climbing, that could be causing the system to warm up. Is the condenser clean.....can you inspect between the radiator and condenser for debris?

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Take care,

Travis

[email protected]

tommystunes on Tue August 04, 2009 5:19 PM User is offlineView users profile

I'm finally back. I had dropped the car off at a shop that recovered and recharged the freon. He said the high side was dropping at the same time the low side was going up.He thinks a compressor change is in order..... comments??

TRB on Tue August 04, 2009 6:27 PM User is offlineView users profile

Not much information to work with!

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

mitchedo on Wed August 05, 2009 8:26 PM User is offlineView users profile

I had a similar problem with my old Suburban. It wouldn't cool unless both the front and rear air was on. If just one or the other was on, then it would cool sometimes, and not cool sometimes. Eventually, it stopped altogether.

Turns out it was a bad low-pressure cycling switch. Once it shut off, it didn't like to come back on. The extra load from both evaporators running kept it from cycling, so it would work better.

...dunno if you have one of those or not.

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Doug
Home of the "Tunex Suburban Disaster"

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