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manifold sealing washers

archie on Tue December 15, 2015 2:06 PM User is offline

Year: 1990
Make: chevy
Model: astro
Engine Size: 4.3l
Refrigerant Type: r134a
Country of Origin: United States

need to know what sealing washers to use. the new compressor came with 3 in a bag. two look very much the same. metal outer ring, rubber insert. the third is much thicker has a red plastic outer ring with a rubber insert. do I use the two the same? need advise. thanks.

GM Tech on Tue December 15, 2015 3:20 PM User is offline

Red is for discharge - plain is for suction should be an S and D printed in rear head near the ports. Bottom line- make the manifold level.

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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......

archie on Tue December 15, 2015 5:21 PM User is offline

so the manifold should sit flush with the body of the compressor. o.k. thanks.

mk378 on Tue December 15, 2015 7:34 PM User is offline

R-12 systems had a flat manifold and flat ports on compressor. Parts for cars that were factory R-134a have a step between the two ports. If you are trying to mate a 134a compressor to a 12 manifold or vice versa you need to use special seal washers that are unequal in thickness.

archie on Tue December 15, 2015 7:44 PM User is offline

yes, I see that. thanks.

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