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AC short-cycling, shutting off at 65lbs

irishman72 on Tue June 08, 2010 10:30 PM User is offline

Year: 1996
Make: Chevy
Model: Silverado
Engine Size: 5.7 Vort
Refrigerant Type: r-134a
Ambient Temp: 96

The AC on my 96 Silverado has never, ever had a problem until recently.

I just replaced the intake manifold gaskets, and during the repair I moved the AC compressor (still charged) over to the passenger side of the engine compartment for the day or so it took the get the job done.

When I put everything back together, the AC short-cycles, 6 seconds on, five or six seconds off.

I hooked up a gauge to the low side fitting. When the clutch engages, the pressure is at 25 lbs. It builds rapidly, and the clutch disengages at 65 lbs. Then re-engages when i drops to 25 lbs.


All the wiring seems tight. There's a plug just behind the clutch/pulley, a plug at the back of the compressor, one by the high-side fitting and another at the dryer.

Any ides? Thanks in advance.

Matt

bohica2xo on Wed June 09, 2010 2:37 AM User is offline

What is the static pressure in the system?


What is the high side pressure when the low side is at 25?

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

irishman72 on Thu June 10, 2010 1:16 AM User is offline

High-side gauge is busted (reads 42 lbs when it's attached to nothing). I'll get another and get back to you.

Thanks.

Matt

Edited: Thu June 10, 2010 at 1:17 AM by irishman72

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