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?
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.
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
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.
The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
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.
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?
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.
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