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Old 06-19-2017, 07:01 AM
Madness Madness is offline
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Name: Lyndel Warren
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Default AC pressure switch?

I have a '79 GMC Caballero, 350" engine. I can't find the pressure switch that turns the compressor on & off. The compressor clutch is staying engaged all the time.(not cycling). Any help, please.
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Old 06-19-2017, 08:27 AM
Chris Nelson Chris Nelson is offline
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On my 86 EC SS it on the accumulator ( looks like a aluminum thermos bottle near the fire wall on passenger side , just unscrew the old one & screw on the new one it shouldn't leak out . Also if your refrigerant is to low it will not turn the compressor on .
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Old 06-19-2017, 10:29 AM
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Chris 57 Chris 57 is offline
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On 79 I believe it's a single wire and switch is in the compressor tiny thing.
If your system is cooling OK it may be the thermal switch up On the HVAC box at fire wall it's a tube and bulb affair
It controls when the system disingages so it doesn't freeze up.
It's clamped to the piping just where the piping goes in the air box
I agree checking you Freon level first
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