Need Help with Heater/AC for 70 C20 pleases!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C20 Blues · 11-16-2008, 09:54 AM

First I want to say Hi.

I am not new to this board but have been away for along time.

So here is the problem my 70 C20 is missing everything in the cab for the Heater/AC and the vacuum lines and wires are all cut up. And I am trying to put back together. I found this pic on one of the Threads is it correct for my truck?? and if so. Where is the Control Head Vacuum Switch and Vacuum Source locations.

JimKshortstep4x4 · 11-16-2008, 07:53 PM

That should be the right schematic for your truck. Here is another schematic that you will need for the wiring.

Jim

Lugnut64052 · 11-16-2008, 08:22 PM

The control head is built into the heater/AC control unit in the dash. It's about the size of a quarter, and rotates when you move the appropriate control lever.

The vacuum source is the port on the rear of the intake manifold between the carburetor and distributor.

C20 Blues · 11-16-2008, 10:06 PM

Thanks for the help.

*chevy29267truck* · 11-16-2008, 11:30 PM

i know when i got my 67 chevy 3/4 ton truck it was missing a lot of that under the hood and dash

11-16-2008, 09:54 AM	#1
C20 Blues Registered User Join Date: Jan 2007 Location: Hesperia,Ca Posts: 7	Need Help with Heater/AC for 70 C20 pleases!!! First I want to say Hi. I am not new to this board but have been away for along time. So here is the problem my 70 C20 is missing everything in the cab for the Heater/AC and the vacuum lines and wires are all cut up. And I am trying to put back together. I found this pic on one of the Threads is it correct for my truck?? and if so. Where is the Control Head Vacuum Switch and Vacuum Source locations. Attached Images Last edited by C20 Blues; 11-16-2008 at 09:56 AM.

11-16-2008, 07:53 PM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Need Help with Heater/AC for 70 C20 pleases!!! That should be the right schematic for your truck. Here is another schematic that you will need for the wiring. Jim 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

11-16-2008, 08:22 PM	#3
Lugnut64052 Middle-aged Curmudgeon Join Date: Jun 2008 Location: Independence, MO Posts: 753	Re: Need Help with Heater/AC for 70 C20 pleases!!! The control head is built into the heater/AC control unit in the dash. It's about the size of a quarter, and rotates when you move the appropriate control lever. The vacuum source is the port on the rear of the intake manifold between the carburetor and distributor.

11-16-2008, 10:06 PM	#4
C20 Blues Registered User Join Date: Jan 2007 Location: Hesperia,Ca Posts: 7	Re: Need Help with Heater/AC for 70 C20 pleases!!! Thanks for the help.

11-16-2008, 11:30 PM	#5
chevy29267truck Account Suspended Join Date: Sep 2008 Location: Alva Florida Posts: 668	Re: Need Help with Heater/AC for 70 C20 pleases!!! i know when i got my 67 chevy 3/4 ton truck it was missing a lot of that under the hood and dash

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