Automotive Air Conditioning Information Forum (Archives)

archie on Wed January 06, 2016 9:42 AM

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

hi, i'am trying to rebuild a h6 compressor. does this compressor have a front seal? also how many o rings and gaskets does it have? do you think this compressor is a good candidate for a rebuild? I only see three large case o rings, if present. where are the other ones?

GM Tech on Wed January 06, 2016 10:05 AM

Shaft seal and o-ring,- front head to front cylinder o-ring, front cylinder to rear cylinder o-ring, rear cylinder to rear head o-ring, rear head has HPRV o-ring and HPCO switch o-ring as well. All body o-rings are the same size.

Gaskets between valve plates and heads can be re-used- but come in rebuild kits. Be careful to never rotate the parts- I always scribe a line across all four components (on outside) so as to put back together proper. Although FH only can be rotated for various mounting configs

Later model H-6s did away with internal gaskets. as well as shaft nut.

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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......

Edited: Wed January 06, 2016 at 10:08 AM by GM Tech

archie on Wed January 06, 2016 11:42 AM

I've done a google search and can't find a rebuilt kit for this compressor. where can I buy one? the cylinder walls are slightly scored. I didn't scribe a line is there a way to get it back together correctly. will this rebuild be successful?

GM Tech on Wed January 06, 2016 12:24 PM

You can study discharge cavities in heads and match up crossover chambers (hi side from front head to hi side in rear head)- identify high side cavities and make sure they never communicate with low side cavities....

-------------------------
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 Wed January 06, 2016 2:40 PM

thanks gm tech. what o ring/gaskets would you say have to be changed? or should I attempt to change all? where can I buy rebuild kit?

GM Tech on Wed January 06, 2016 6:12 PM

I call it a "Re-seal" since I do nothing to machine any parts- just change o-rings and clean sealing surfaces- I always change shaft seal- go to a new style double lip seal- and the 3 body o-rings- the HPCO switch o-ring and HPRV o-ring are usually ok- just leave it all alone. I re-use the gaskets- kits were online last I knew.

-------------------------
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 Thu January 07, 2016 9:24 AM

does the h6 have a shaft seal/o ring? I've looked for it on the front of the compressor and can't see it. is it held in with a c clip?

GM Tech on Thu January 07, 2016 9:50 AM

As long as your unit is OEM, and not a replacement of some knock-off- then yes you have a shaft seal o-ring- in-between the shaft seal and the ID of the snout. The shaft seal is held in place with an internal snap ring.

-------------------------
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 Fri January 08, 2016 11:16 AM

thanks gm tech. you have been so helpful.