Defrost Turns the AC on WTH?!?! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RodsGreen10 · 07-25-2015, 11:44 AM

Truck is a 76 factory air.
Put new 385 stroker in with Sanden AC compressor 1 wire deal.
Also put new heater control on dash in.

When I slide over to heater it's fine no AC but very little heat at all and motor is at temp. But when I slide it on over to defrost the blend door dumps you can hear it and the AC clutch engages and blows cold air. WTH guys?? Any have any idea point me in the right direction. If you need more info ask and I will tell you.

07-25-2015, 11:44 AM	#1
RodsGreen10 Registered User Join Date: Jun 2015 Location: Richmond,KY and Knoxville,TN Posts: 1,584	Defrost Turns the AC on WTH?!?! Truck is a 76 factory air. Put new 385 stroker in with Sanden AC compressor 1 wire deal. Also put new heater control on dash in. When I slide over to heater it's fine no AC but very little heat at all and motor is at temp. But when I slide it on over to defrost the blend door dumps you can hear it and the AC clutch engages and blows cold air. WTH guys?? Any have any idea point me in the right direction. If you need more info ask and I will tell you.



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