Air Conditioning problem
2000 Nissan Xterra 6 cyl Two Wheel Drive Automatic
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The A/C cools good when the outside air is cool and when the engine is run for the first time. After it has been shut off, the A/C doesn't cool during hot weather. I checked the low side pressure with one of those R-134 cans with the gauge and it's running at 60psi at idling speed. The pressure goes down to about 40psi with increased RPM's. Sometimes after driving for a long period, the air might begin to cool off. That's about it. Please help.

Hi Charles Owens,

It could be expansion valve, excessive refrigerant or compressor.

Check high pressure for abnormality.