73-87 LS Swap How to keep heat & defrost at least? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NastyBuzzard · 09-04-2015, 07:12 AM

This may be a dumb question or I may be overthinking it.

I am LS swapping my 87 GMC V1500. Skipping dealing with ac for now, however, since I will be driving this winter, I need heat. More importantly I need defrost.

Doesn't the original run off vacuum or something for switching the blend doors or whatever?

I am assuming I can wire in the controller to the 01 wiring (I am using the entire 01 donor harness) in place of the 01 switch. So I will have power to the blower but what else is needed?

09-04-2015, 07:12 AM	#1
NastyBuzzard Registered User Join Date: Oct 2013 Location: Saluda, SC Posts: 1,276	73-87 LS Swap How to keep heat & defrost at least? This may be a dumb question or I may be overthinking it. I am LS swapping my 87 GMC V1500. Skipping dealing with ac for now, however, since I will be driving this winter, I need heat. More importantly I need defrost. Doesn't the original run off vacuum or something for switching the blend doors or whatever? I am assuming I can wire in the controller to the 01 wiring (I am using the entire 01 donor harness) in place of the 01 switch. So I will have power to the blower but what else is needed? __________________ 1988 GMC R3500- Cut Brothers 4WD Conversion Kit, 6.5 TD NV4500/NP208 D60 14BFF 2020 1500 Silverado 3.0 Babymax 2002 2500 Silverado- 6.6/ Allison 2010 CTS V- The "NastyBuzzard" 1979 Trans Am - Eventually getting 6.0/T56 swap with boost

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