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A/C compressor not engaging [message #174208] Thu, 21 June 2012 14:12 Go to previous message
carguy is currently offline  carguy   United States
Messages: 498
Registered: June 2006
Location: Coshocton OH
Karma:
Senior Member
My air conditioner compressor is not engaging. Following the procedure in the maintenance manual I shorted across the terminals on the pressure switch connector and the clutch engages. Per the manual this indicates that the pressure in the line is too low or the switch is defective.

Now my questions:
I'm using DuraCool I'm assuming that the pressure should be 20 -25 psi with the gauge connected to Gauge connection 1 ( see photo http://www.gmcmhphotos.com/photos/misc-gmc-photos/p44570-air-conditioning-clutch-not-functioning.html ). Is my assumption correct?

If the pressure is OK and I need to replace the pressure switch can I remove & replace the switch without opening the line and loosing the DuraCool?

Any comments/suggestions will be appreciated.

Bill Brown
Coshocton OH
'77 Buckeye Cruiser
Change is certain, progress is not

Bill Brown - '77 Buckeye Cruiser
Coshocton OH
carguybill@sbcglobal.net

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