Cycling A/C Compressor
Any air conditioner experts out there? My dash air was operating just fine until a couple of days ago. Here's the deal. I start the rig and turn on the dash air. I can hear the compressor pull the eng...
Forum Discussion
j-d wrote:
I was thinking like marc is - Low Pressure CutOff/LPCO on a CCOT system. 90 PSI isn't much for the HIGH side of an automotive A/C system. If it's R134A, the rule of thumb is 2.2 times ambient temperature. So 80*F would yield 176 PSI high side. But if LOW side (on CCOT) gets down around 20 PSI the LPCO will shut the compressor clutch OFF. In other words, if there's not enough R134A in the system to get the high side above 90, the low could well be falling below 20 and the LPCO would do its job.
OR... a bad LPCO could be cutting the system off prematurely. Some of the LPCO's I've bought did NOT come with the needed O-Ring. You can usually re-use the old one, just don't lose it, cut it, or toss it with the old LPCO. They screw down onto a Schrader Valve, so replacing one should not cause loss of refrigerant.
You are missing that he has NO gauge for the Hi side. Only a low side and that was at 40 psi when running and THEN went to 90 when the compressor cycled OFF which IS NORMAL. He has not posted and does not know what the Hi side is. Doug
