Heater Explanation? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mike Quillici · 11-13-2009, 01:57 AM

I know this is probably asking a lot, but could anybody out there provide me with a detailed explanation of how the climate control system in a 1972 C-10 (with A/C) works? I'm trying to get my defroster (heater) working, and all I see is a mess of vacuum hoses, cables, and wires. Is there a diagram out there anywhere that explains what the heck is going on? I'm confused.

Mike Quillici · 11-13-2009, 03:16 AM

After reading this over, maybe I should be more specific.

The A/C compressor has been removed, and the blower motor is shot. I have a new one on order. However, I also noticed that the vacuum hose which runs from the vacuum pod on the passenger side fender through the firewall wasn't hooked up, and the valve that controls the return of coolant from the heater core to the radiator wasn't opening. So, I hooked up the vacuum line from the vacuum pod through the firewall (there was a little nub sticking out), and I still don't appear to be getting coolant flow through the heater core, even with the temperature control on hot. It's getting cold, and a defroster would be an amazing luxury.

JimKshortstep4x4 · 11-13-2009, 07:00 AM

For now, try hooking up a vacuum source directly to the water valve, The valve is normally closed until vacuum is applied which will stop the water flow.

Jim

haysonj · 11-13-2009, 08:34 AM

Quote:

Originally Posted by Mike Quillici

I know this is probably asking a lot, but could anybody out there provide me with a detailed explanation of how the climate control system in a 1972 C-10 (with A/C) works? I'm trying to get my defroster (heater) working, and all I see is a mess of vacuum hoses, cables, and wires. Is there a diagram out there anywhere that explains what the heck is going on? I'm confused.

here is what you need hope it helps

11-13-2009, 01:57 AM	#1
Mike Quillici Registered User Join Date: Oct 2009 Location: Sacramento, CA Posts: 161	Heater Explanation? I know this is probably asking a lot, but could anybody out there provide me with a detailed explanation of how the climate control system in a 1972 C-10 (with A/C) works? I'm trying to get my defroster (heater) working, and all I see is a mess of vacuum hoses, cables, and wires. Is there a diagram out there anywhere that explains what the heck is going on? I'm confused. __________________ 1972 Chevy C-10 ~ 188,000 miles give or take

11-13-2009, 03:16 AM	#2
Mike Quillici Registered User Join Date: Oct 2009 Location: Sacramento, CA Posts: 161	Re: Heater Explanation? After reading this over, maybe I should be more specific. The A/C compressor has been removed, and the blower motor is shot. I have a new one on order. However, I also noticed that the vacuum hose which runs from the vacuum pod on the passenger side fender through the firewall wasn't hooked up, and the valve that controls the return of coolant from the heater core to the radiator wasn't opening. So, I hooked up the vacuum line from the vacuum pod through the firewall (there was a little nub sticking out), and I still don't appear to be getting coolant flow through the heater core, even with the temperature control on hot. It's getting cold, and a defroster would be an amazing luxury. __________________ 1972 Chevy C-10 ~ 188,000 miles give or take

11-13-2009, 07:00 AM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Heater Explanation? For now, try hooking up a vacuum source directly to the water valve, The valve is normally closed until vacuum is applied which will stop the water flow. Jim __________________ 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



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