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R4 Compressor

mhueffman on Sun March 29, 2015 9:19 AM User is offline

Year: 1987
Make: Buick
Model: Grand National
Engine Size: 231
Refrigerant Type: R12

Replacing the entire AC system in my 87 Buick Grand National with the exception of the evaporator. I have a new GM R4 compressor that differs from the original where the lines hook hook up. The original has orings in the housing. The replacement has different seals that install over the hose block. The instructions weren't the greatest but looks like I have two washers that will stick out of the housing the same amount so guess that is what I need to use. The question I have is there are two aluminum inserts and need to choose which one to use and can't really see what it will do anyway.

GM Tech on Sun March 29, 2015 2:54 PM User is offline

I've never used the inserts- they are for a really old style manifold that had no pilots--use I use the red and standard (alumium colored) sealing washers to level out the manifold connection.

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......

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