72 AC/heater wiring without anti-dieseling - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**landarts** · 02-04-2019, 04:06 PM

I have a 72 Cheyenne that I am trying to build a new AC/Heating harness for. The truck has a brand new AAW Classic Update wiring harness in it, which does not cover the AC/heating harness portion. On my truck it did not have the anti dieseling relay.

So the part I am trying to figure out is the compressor switch on the backside of heater. Diagram shows 14Y to control switch, 14DG out to the AC compressor and 14DG out to anti-dieseling relay. So just hookup the one to the switch and compressor and don't worry about anti-dieseling relay?

*randy500* · 02-04-2019, 04:48 PM

Quote:

Originally Posted by landarts

I have a 72 Cheyenne that I am trying to build a new AC/Heating harness for. The truck has a brand new AAW Classic Update wiring harness in it, which does not cover the AC/heating harness portion. On my truck it did not have the anti dieseling relay.

So the part I am trying to figure out is the compressor switch on the backside of heater. Diagram shows 14Y to control switch, 14DG out to the AC compressor and 14DG out to anti-dieseling relay. So just hookup the one to the switch and compressor and don't worry about anti-dieseling relay?

I have parted dozens of ac trucks and never seen the relay and have a few harness here which don’t have it either, just run the switch to the compressor.

**landarts** · 02-04-2019, 08:25 PM

OK , thanks for the quick response.

02-04-2019, 04:06 PM	#1
landarts landarts Join Date: May 2005 Location: Star, Idaho Posts: 1,415	72 AC/heater wiring without anti-dieseling I have a 72 Cheyenne that I am trying to build a new AC/Heating harness for. The truck has a brand new AAW Classic Update wiring harness in it, which does not cover the AC/heating harness portion. On my truck it did not have the anti dieseling relay. So the part I am trying to figure out is the compressor switch on the backside of heater. Diagram shows 14Y to control switch, 14DG out to the AC compressor and 14DG out to anti-dieseling relay. So just hookup the one to the switch and compressor and don't worry about anti-dieseling relay? Attached Images __________________ Super Cheyenne aka the "Devil Cowboy" 71 K20 Idaho Edition 69 K10 from the Field 68 Second Chance Fix and Sale 72 GMC 3/4 ton 4x4 K2500 The "Fixrupr" build thread 72 Cheyenne 1/2 ton " FIXRUPR " - daily driver 67 C20 all original paint 71 K20 Custom 4x4 (Idaho Edition) 72 K20 GMC Super Custom 4x4 72 K20 Custom Deluxe 4x4 69 K10 Custom package 4x4 (69 K10 from the field) 72 K10 Custom 71 K10 Custom 72 K20 Custom Deluxe 4x4 72 K20 Crew Cab Project 71 GMC Jimmy CST 72 Blazer 70 Blazer

02-04-2019, 08:25 PM	#3
landarts landarts Join Date: May 2005 Location: Star, Idaho Posts: 1,415	Re: 72 AC/heater wiring without anti-dieseling OK , thanks for the quick response. __________________ Super Cheyenne aka the "Devil Cowboy" 71 K20 Idaho Edition 69 K10 from the Field 68 Second Chance Fix and Sale 72 GMC 3/4 ton 4x4 K2500 The "Fixrupr" build thread 72 Cheyenne 1/2 ton " FIXRUPR " - daily driver 67 C20 all original paint 71 K20 Custom 4x4 (Idaho Edition) 72 K20 GMC Super Custom 4x4 72 K20 Custom Deluxe 4x4 69 K10 Custom package 4x4 (69 K10 from the field) 72 K10 Custom 71 K10 Custom 72 K20 Custom Deluxe 4x4 72 K20 Crew Cab Project 71 GMC Jimmy CST 72 Blazer 70 Blazer



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