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2002 Pontiac Trans Am freezing up

dannyual767 on Wed July 18, 2012 4:32 PM User is offlineView users profile

Year: 2002
Make: Pontiac
Model: Trans Am WS6
Engine Size: 346
Refrigerant Type: 134a
Country of Origin: United States

It's been a while since I've been on this forum but I'm back because two of my vehicles are having some problems. It's time for me to dust off my manifold and gauges!

My 2002 Trans Am cools just fine around town but on long drives, it'll freeze up. I'm pretty sure that the low pressure switch is bad or needs to be adjusted (if able.) Does this sound right? I'm about to take it on a trip soon and I know the ac will freeze up and blow warm air after an hour or so on the interstate so I'd like to fix it soon. Thanks for any help you can give me.

GM Tech on Wed July 18, 2012 5:04 PM User is offline

Good luck trying to find your low pressure switch-- you have none-- you have a V-7 compressor with a control valve that controls evap freeze-up and destrokes the compressor- One other reason for evap freezing is air in the system- has anyone ever discharged and recharged your system without pulling a vacuum first?

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

dannyual767 on Wed July 18, 2012 6:28 PM User is offlineView users profile

I've owned the car since brand new and the system has never been opened up. It cools great but the freezing up makes longer trips miserable.

Are there any other things that I can check to cure this freezing up problem or am I looking at a compressor replacement ?

Edited: Wed July 18, 2012 at 6:31 PM by dannyual767

GM Tech on Wed July 18, 2012 8:18 PM User is offline

control valve replacement-- or just turn off a/c for 2 minutes every half an hour on a trip

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

mk378 on Wed July 18, 2012 8:53 PM User is offline

Hook up gauges, set interior fan on low, rev the engine, watch the low side should not go below about 20 psi. If it does the control valve is not working.

dannyual767 on Wed July 18, 2012 9:55 PM User is offlineView users profile

Quote
Originally posted by: GM Tech
control valve replacement-- or just turn off a/c for 2 minutes every half an hour on a trip

Quote
Originally posted by: mk378
Hook up gauges, set interior fan on low, rev the engine, watch the low side should not go below about 20 psi. If it does the control valve is not working.

Okay, now I understand. The "control valve" is suspect. I know that I need to put my gauges on it and I will before I replace any parts. I'm probably going to have to do what GM suggests for my next long drive since I don't think that I'm going to have time to do any underhood work due to career work. Two minutes off every half hour won't be too bad.

Where is the control valve located?

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