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GM Compressor Oval O-Rings

retrofit on Sun July 20, 2008 1:11 PM User is offline

Are the GM compressor suction/discharge o-rings in the kit sold by Arizona Mobile Air oval or round?

GM changed the design in 1988 from round to oval. GM says the oval ring is backward compatible with o-ring compressors made 1966 - 1993 and no longer sells round ones.

4-Seasons sell both types and claim the round one is “standard”.

GM Tech on Sun July 20, 2008 1:57 PM User is offline

I use all oval when needed- but anymore mostly see sealing washers- since the change to sealing washers in the early 90's-- I don't believe there are any compressor built new with o-rings grooves- since there is a sealing washer conversion kit-- any o-ring compressors would be older ones that either are still functioning- or that have been rebuilt- All OEM pumps are sealing washers- a much better seal.

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

retrofit on Mon July 21, 2008 10:56 PM User is offline

No doubt the sealing washer is a better way to go but they can’t be used on an o-ring style compressor. There are lots of those still around and people are still converting them (even A6's) to R134a.

The oval ring looks like it doesn’t fit right cause it leaves a gap around the groove but that’s “normal and expected” according to ACDelco.

Anyhow, I got the answer to my original question and the suction/discharge port o-rings in the GM kit sold by AMA are oval.

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