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AC question

italian_guy007us01 on Sun April 27, 2008 9:30 AM User is offline

Year: 1995
Make: Chevy
Model: Tahoe
Engine Size: 350
Refrigerant Type: R134a

I am new to this forum and I hope that someone can help me. When I went to pull the pressure readings on my tahoe, it had ZERO refrigerant in it. So, I am tearing it apart to replace the receiver drier and all O-rings prior to a vacuum and recharge. My question is about the seals/o-rings that are used to join the hose to the compressor. When I took off the hose, there were 2 end seals; both are thin and they measure 3/4 and 5/8 ID respectively. When I looked at the PDF exploded file for the Harrison R4 compressor here on this site, it shows O-rings go behind those seals? The parts legend say that O-rings are optional? I never worked on Harrison compressors before so I need to know do I install the O-rings in front of the seals like the PDF file shows, or do I just put the new seals in without the O-rings like it was before I tore it apart? If O-rings belong in there, would this account for why I lost all the refrigerant? Where else would a massive leak occur?
Thanks a bunch for all those that help me!!


GM Tech on Sun April 27, 2008 4:52 PM User is offline

Your pump uses sealing washers- not o-rings- O-rings are used on the older compressors- so your PDF is old-- o-rings are only used if the compressor has o-ring grooves- if the sealing surface is flat, then sealing washers are used.

Your leak is most likely the compressor shaft seal or the compressor body shell o-ring seals- look for oily/greasy residue about the front of the compressor to verify.....or on the compressor body.........

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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