Year: 1991
Make: Pontiac
Model: Trans Sport
Engine Size: 3.1L V6
Refrigerant Type: r134a
Ambient Temp: n/n
Pressure Low: n/n
Pressure High: n/n
Country of Origin: United States
Hello again! I was wondering if anybody is particularly experienced enough with this compressor to tell me what the two harnesses running to the back of the compressor near the refrigerant line would be? Is there a way to your knowledge these lines could be tested?
Thank you in advance =)
I assume you mean wiring harnesses.....correct?
They are to switches that monitor discharge pressure- one switch with light blue wire is the high pressure compressor cut-pout switch, the other is the cooling fan request switch- if head pressure hits 175 psi the cooling fan(s) come on.
PS- I'm dooing this from memory- should be right.....
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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......
Thanks for the information, it should help =)
I've been trying to get this clutch to engage and spin my compressor up, but to no avail. I have 13+ volts at the clutch coil, have tried tapping on the clutch and it still wont engage. The coil reads 4.2ohms, but I read somewhere it should be between 3-4ohms. I think it's time to just replace the entire compressor assembly. Unless someone has some testing advice?
I have gotten the fans to come on by jumpering the high side switch, that's the best I've gotten so far! lol
Edited: Thu June 16, 2011 at 3:35 PM by kwandobe
Even if the clutch coil is bad, that still doesn't mean you have to replace the entire compressor; you can just replace the clutch coil.
Also, 4.2 shouldn't make or break. Try applying +12V fused directly to the battery - bypassing the vehicle wiring - if the compressor clutch now engages, it's the relay or wiring.
Having 13V at the clutch doesn't mean you have the necessary current to pull the clutch in.
Joe
Bad a/c relay can act as you describe.
-------------------------
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......
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