Engine Size: 4.3
Refrigerant Type: R12
Ambient Temp: 95
I have a project 1989 S10 I just picked up. Very good condition for its age, just a bad compressor. Anyways, I bought a new R4 from Napa(Not remanufactured) and where the manifold bolts up is different than the old one. The old Harrison had equal suction and discharge ports with 2 black o rings. The new one has 2 different size holes, and came with 3 sealing washers. 2 red and 1 green, with green being the bigger one, with 2 metal bushings 1 short and 1 long. If anyone has put one of these compressors on one of these trucks, let me know what ones to use. I usually buy the remanufactured ones and they have the old style ports, so I have never ran into one set up like this.
Use the red in the discharge port and a standard flat sealing washer in the suction port- the whole goal is for the manifold block to be level.
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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