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roll my own

kevindtimm on Sun August 17, 2008 3:23 PM User is offlineView users profile

Year: 1962
Make: Chevy
Model: C10
Engine Size: 350
Refrigerant Type: R134a
Country of Origin: United States

I have a GM serpentine system (R4 compressor), as well as a vintage air installation kit (hoses, fittings, etc) a new condensor as well as an allegro mark iv underdash evaporator.

I have searched and searched and searched (here and the rest of the internet) and cannot find a diagram that tells me which of the ports on the back of the compressor is suction or pressure.

Also, when I put voltage on the compressor, how hard should it be to turn the compressor? Can I turn it by hand, by socket wrench (can I grip the bolt holding the clutch and turn it?) or a strap wrench?

Thanks, Kevin

TRB on Sun August 17, 2008 5:16 PM User is offlineView users profile

Pretty simple to tell. Put you thumb over one of the ports on that back of the compressor. Turn the hub a few times, one side will pull suction one will have pressure. Many compressors have an S or D stamped by the port.

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kevindtimm on Sun August 17, 2008 5:20 PM User is offlineView users profile

but, when I engage the clutch, I can't turn the compressor by hand - nor can I turn it with a wrench in the front - so I can't answer that question yet

iceman2555 on Sun August 17, 2008 6:34 PM User is offlineView users profile

GM compressors are almost impossible to rotate by hand....the use of a spanner wrench or a clutch turning tool is recommended.
The suction port of this compressor is the larger of the two ports......unless they are the same size...then.....well...the suction port of a R4 is the port close to the center of the compressor.....hope this helps.


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TRB on Sun August 17, 2008 6:44 PM User is offlineView users profile

If you have a vice the opens wide enough you can use that just catching the outside diameter of the hub. That's what we use in the shop to spin it before installing on a vehicle.

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Contact: ACKits.com

kevindtimm on Sun August 17, 2008 8:53 PM User is offlineView users profile

Quote
Originally posted by: iceman2555
GM compressors are almost impossible to rotate by hand....the use of a spanner wrench or a clutch turning tool is recommended.

The suction port of this compressor is the larger of the two ports......unless they are the same size...then.....well...the suction port of a R4 is the port close to the center of the compressor.....hope this helps.

Thanks for the information, this is what I need to know - thx thx thx

kevindtimm on Tue August 19, 2008 1:58 PM User is offlineView users profile

Oh well, looks like I waited too long to hook this up, it's frozen solid. I put voltage on the clutch and the belt screamed like a stepped on kitty cat. bummer, guess I'll have to get a new one. Unless, of course, these can be rebuilt?

mk378 on Tue August 19, 2008 2:25 PM User is offline

The R4 is not a shining example of GM's technology. Fitting a different model compressor if possible would save some headaches now and in the future.

kevindtimm on Wed August 20, 2008 11:59 AM User is offlineView users profile

because it's a serpentine system, there's not much hope for getting another compressor to fit (at least, not that I know of).

Anyone else have any suggestions?

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