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JimKshortstep4x4 · 03-21-2010, 09:31 AM

Unless it has been added there is not a low pressure switch on the compressor. I would suggest using a jumper wire to the compressor, (positive side) to see if the clutch will pull in, engine off).

Here is a diagram of the wiring on the AC. (I have not seen trucks with the anti-dieseling relay so yours probably does not have one).

03-21-2010, 09:31 AM	#6
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: 67 air conditioner problems Unless it has been added there is not a low pressure switch on the compressor. I would suggest using a jumper wire to the compressor, (positive side) to see if the clutch will pull in, engine off). Here is a diagram of the wiring on the AC. (I have not seen trucks with the anti-dieseling relay so yours probably does not have one). Attached Images __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC Last edited by JimKshortstep4x4; 03-21-2010 at 09:33 AM. Reason: wording