Heater control vacuum hoses? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevydog66 · 09-22-2013, 09:05 PM

I'm not sure which vacuum hose goes where on the heater contol vacuum switch because I am not getting vacuum to the heater valve or flapper doors. I have a 72 GMC with factory a/c and it has 3 ports on the vacuum switch. 1 of them is plugged. It's a real p-i-t-a to get to it also. I just repainted and rebuilt the whole truck so I just marked the lines when I removed them. I also installed new vac hoses as well. If you are looking up at it the hose closest to the front of the truck is blocked off and always has been. Is this correct? IIRC the ports are labeled 1,2,3. Also, which port do I connect to vacuum canister?

09-22-2013, 09:05 PM	#1
chevydog66 GM ONLY BABY!!! Join Date: Oct 2003 Location: Fort Wayne, IN. Posts: 1,998	Heater control vacuum hoses? I'm not sure which vacuum hose goes where on the heater contol vacuum switch because I am not getting vacuum to the heater valve or flapper doors. I have a 72 GMC with factory a/c and it has 3 ports on the vacuum switch. 1 of them is plugged. It's a real p-i-t-a to get to it also. I just repainted and rebuilt the whole truck so I just marked the lines when I removed them. I also installed new vac hoses as well. If you are looking up at it the hose closest to the front of the truck is blocked off and always has been. Is this correct? IIRC the ports are labeled 1,2,3. Also, which port do I connect to vacuum canister? __________________ 2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up

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