Ford A/C :: Compressor Stay On Always?


Apr 19, 2012

Okay...it's a GMC but the forum I use for it kinda blows.

The AC Compressor stays on even if the HVAC controls are all in the off position. In fact, I completely disconnected the controls and it still operates.

Problem is that it won't cycle (on & off) and I risk breaking something expensive.

If your truck had this problem, where would you start?

What I do know:

1. The relay is good as I have a brand new one in there.
2. Someone just put two 12oz. cans of R143a in it for me.

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Outside temp was about 60F, I think my therm was showing 57F to be exact. When I checked the low side pressure with the engine off, the gauge reading was below 15. It made sense that the compressor wouldn't start at the pressure. I put in about a 1/2 can with the motor running A/C on max and it was showing 40, but still no compressor cycling. I then shut the motor down, let it sit for about 3 mins and restarted. This time, the compressor started to cycle, it was cycling quickly though, I'd say about every 3 seconds.

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