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R4 manifold O rings not sealing washers

my2monkeys on Tue May 13, 2014 8:21 PM User is offline

Year: 86
Make: GMC
Model: Cabellero
Engine Size: 5.0
Refrigerant Type: R 12
Country of Origin: United States

The R4 went out on the truck, the front seal leaked and the rear hose connection was leaking.

Got a used R4 at the junk yard with same GM part #, problem is I cant locate the o rings seals for the manifold block.

Just the "sealing washers" and they wont work.

Mine has a groove for an o ring around the ports on the compressor with a square profile it appears.(the old and new-used one)

does anyone know where to get these washers?

Is it worth it to go back with the R4? and R 12?

Thanks, Colin

GM Tech on Tue May 13, 2014 10:01 PM User is offline

The o-rings are NOT square, they just form that way after being used-- they were originally round profile. I worked in the R-4 factory, seen a bunch of those- put a new shaft seal in it as well...

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......

my2monkeys on Thu May 15, 2014 9:43 PM User is offline

my2monkeys on Thu May 15, 2014 9:48 PM User is offline

Thanks for the info.

Do you know a source for these o rings?

I can only find the washers with metal around them.

Will the o rings in the ACkits for GM R4 work?

WyrTwister on Fri May 16, 2014 1:30 PM User is offlineView users profile

Take the old ones to a local NAPA auto parts or O'Reilly & get them to match them up with new " green " o-rings .

God bless ,

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