Automotive Air Conditioning Information Forum (Archives)

mhfd112 on Sat June 11, 2011 12:36 PM

Year: 2000
Make: Nissan
Model: Exterra
Engine Size: v6
Refrigerant Type: R134a
Ambient Temp: 82
Pressure Low: 45
Pressure High: 225
Country of Origin: United States

I put a high side line on this vehicle for a friend. Vacuumed and charged it and had trouble with the compressor shutting off. We could turn the car off and let it set for a few minutes and then restart and the compressor would run for just a little and then shut off again. We were able to get the full charge in, but the compressor won't run long enough to get any real cooling. Tapped around on the clutch face with no results.

Thanks,

JJM on Sat June 11, 2011 1:12 PM

Are you getting +12V at the compressor clutch when the A/C is on? If so, have you tried disconnecting the compressor clutch connector and applying +12V (fused) directlly to the compressor? If the clutch is now positively engaging with +12V from the battery and not the +12V from the wiring harness, chances are the compressor relay contacts are bad, or there's a problem with the wiring.

If the compressor is not enganging with +12V being applied directly to the compressor, then the clutch gap is either too wide, or the clutch is weak or bad. And you don't have to replace the entire compressor if just the clutch is bad (unless you're buying brand new, you could end up with an even worse compressor).

Joe

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