Can't believe it would be 2 GM Compressors that are bad.


Hello Scotty, I have a 2002 Chevy Silverado 2500 HD, 8.1 liter Vortec, Allison transmission, 260,xxx miles.

Driving down the Interstate, I had an AC line blow apart on me at the compressor. Replaced the line and compressor (due to unknown oil level in compressor, being on the safe side) with an GM direct replacement. Also replaced the orifice.

Installed, Vacuumed for an hour, charged the system and it worked great for about 55 miles at hwy speed. Got in, started it up to drive home and no AC.

Put the gauges on it and both the low and the high sides were reading virtually the same pressures. About 100 psi when the compressor is running, which is cycling on and off.

Figure the compressor was bad and bought another AC compressor directly from GM. Did all the same prep, but this 2nd new compressor is doing the same exact thing and is having a very difficult time taking in Freon. Over 1/2 hour and not even 6 ounces have been put in.

With the 6 oz. in the system, static pressure on both the LP & HP gauges reads 90 psi

I have a hard time believing 2 new compressors are bad straight from GM. Where should I look next?

Comments (1)
No. 1-1
Scotty Kilmer
Scotty Kilmer


And though you should always replace the condenser along with the compressor accumulator and flush the system out