Automotive Air Conditioning Information Forum

Sounds like you have several issues.

1) Clutch gap. Obviously the compressor was NOT turning the first time you tested. With 100k on the clock an excessive clutch gap is a given.
Adjust the gap.

2)Possible Blend door issues.
With a cold & sweating line in to the evaporator something is getting cold.

3) Possible charge level issues
If it is cycling on low pressure with a full load on the evaporator it is probably low on charge. But just adding some refrigerant is not the answer. You should recover & weigh the charge to determine if it actually needs more refrigerant.

Your full load test is skewed by adding box fans. Your results are odd, I am hoping you misstated the relationship between the two low side pressures & the compressor engagement. It should engage at 45 psi & disengage at 22 psi.

If it is cycling on a low charge the rate of cycling should increase at higher rpm.

.

First off, yea, I fat fingered the on/off info for the compressor cycle. Should be just like you described! Bad thing is, I had it all wrote down correct but still typed it in wrong.

1. Clutch was replaced by a NAPA reman. several years ago. Car had approx 63000 on it then. I replaced it with compressor on the car, this has been the only repair on AC system. On the first test I am certain the clutch was engaged and compressor was turning.

2. Possible, have not checked that.

3. I agree 100% about the adding freon as a "possible" fix. If I even do this at all it will be in small amounts. A couple of ounces and re-check.

Should the inlet and outlet of the evap be close to the same temp?

Thanks for your help, any other ideas will be appreciated.

Joel