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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.


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?


"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.



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

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