Issue with my A/C clutch not engaging

Tiny
KOBENORTON
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 217,000 MILES
I have been having an issue with my A/C clutch not engaging. I have pulled the relay and jumped the terminals and it will engage that way. So I’m assuming that either the high or low pressure switch is bad. I will replace both beings they aren’t too expensive. But I am wondering if it would be okay to just leave the relay jumped for the time being? It’s over 100 degrees so I didn’t know if I could just allow the clutch to stay engaged without damaging anything. I was also thinking about just running two wires from the relay where I would typically have it jumped, to a switch and have the switch in the cab, so I could manually turn the clutch in and off. If I did do that how often would I want to cycle the clutch? What are the risks of letting the compressor stay engaged too Long?
Saturday, July 3rd, 2021 AT 2:59 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

First, I would assume nothing as far as the switches until testing is done and verified. I attached a wiring diagram for you to view. Check the high-pressure switch for power and the low side is a transducer.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

As far as running it bypassed, you will ice up the evaporator to the point that you could damage the compressor since it has no protection.

Roy

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Sunday, July 4th, 2021 AT 5:12 AM

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