vacuum actuated heater shutoff help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Custom 68 · 05-24-2008, 04:51 PM

well ok I hope that title makes sense. Anyway I have got my AC running but have seen a valve that shuts off the hot water to the heater core that uses vacuum to operate.
does anybody have a part number I know they had them on several vehicles?
And how does it work is it just kindof on or off working off the AC switch or does it regulate based off the hot to cold lever? I have my inside to outside vaccum doors working but never had one of these on my original AC truck.
Any help or thoughts if I need one or not would be great.

Thanks
Dave

05-24-2008, 04:51 PM	#1
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	vacuum actuated heater shutoff help well ok I hope that title makes sense. Anyway I have got my AC running but have seen a valve that shuts off the hot water to the heater core that uses vacuum to operate. does anybody have a part number I know they had them on several vehicles? And how does it work is it just kindof on or off working off the AC switch or does it regulate based off the hot to cold lever? I have my inside to outside vaccum doors working but never had one of these on my original AC truck. Any help or thoughts if I need one or not would be great. Thanks Dave __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

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