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Originally Posted by Moneypit SEL
I'm counting on the fact that the A/C works when first started. Therefore, the evap sensor resistance at start-up allows compressor engagement.
Therefore, a resistor of the same value would simulate evap. conditions at startup. If the compressor still shuts off after 4 minutes, the evap sensor is not the problem. If, however, the compressor continues to run, it's likely that the evap sensor is at fault.
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If it continues to run, I agree with you.
If it shuts off, it may be the resistor value is not to spec. I think it's possible that there is a delay in the PBU before it drops the compressor out. The fact that it is not instantaneous does not necessarily mean theat it is within spec for the first four minutes. But, I'm just grasping here.
What leads me to believe this is the four minute time frame is the same, no matter if the evaporator is at 80 degrees or if it was just run and it is at 50 degrees. The time does not seem to be related to evap temp. You would think that the colder evap would cause a compressor shutdown earlier on the second and subsequent runs. While this is possible (because I have not timed it carefully enough), it doesn't appear to be the case.