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going crazy

chucksspeedshop on Mon June 22, 2009 8:31 PM User is offline

Year: 1999
Make: vw
Model: beetle
Engine Size: 2.0
Refrigerant Type: 134a
Ambient Temp: 95
Pressure Low: 35
Pressure High: 225
Country of Origin: United States

I have replaced the compressor, drier, expansion valve. I flushed the evaporator, and lines while replacing. I added the recommended amount of oil and the air would cool at idle with pressures of 35 low and 225 high. When you accelerate the engine for a few minutes the high side drops to 140-150 and it quits cooling but the low side stays within the 25-35 range. I replaced the expansion valve, compressor and also the condensor. I flushed the evaporator and lines again but still have the same problem. The car cools fine idling in the shop, but give it gas or drive it and it quits cooling. The vent temp when idling is about 38-40 degrees. I'm wondering if I'm having expansion valve problems. I have flushed it twice so Iknow it has the right amount of oil. Any help would be appreciated. Thanks, Chuck.

TRB on Mon June 22, 2009 9:35 PM User is offlineView users profile

If you are 100 percent sure on the charge level! I would say your compressor is not working correctly. This vehicle uses a variable displacement compressor with a history of control valve failures. We also had a bad supply of expansion valves which were returned to a major vendor. If they are still selling them no matter how many of that brand you will have issues like you are seeing.

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mk378 on Tue June 23, 2009 9:39 AM User is offline

I'd suspect the expansion valve first, maybe you got a bum one (or are you saying you've already replaced it twice?). Variable compressor will never pump the low side below about 20 no matter what, even with a total blockage in the system. So it looks like the compressor may be doing its thing OK.

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