Heater Valve Woes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Durwood · 07-07-2002, 06:02 PM

So, I have an A/C cab with no A/C. All that's left in the engine compartment is the drier. There is no heater valve, as there isn't any vacuum to control it, so the hose goes straight to the core. Even when the fan's not on, that stupid thing is pouring heat into my cab, and it's the middle of summer...

What can I do? Do the non-A/C trucks have a manual heater valve or are they vacuum controlled, too? Any suggestions?

Thanks!

my new 72 · 07-07-2002, 06:19 PM

Take the heater hoses off the Core, and use one of them to loop the system bypassing the core for now, and then figure out what is going on with the switch. Not a fix, just a bandaid to keep you from boiling for now.

mark25 · 07-07-2002, 06:48 PM

you can go to your local parts store and get a manual shut off valve for your heater that goes in line to stop water flow to the heater core. i had the same problem with the vacuum operated water valve so i put in the manual valve and no more heat in cab!!

jlmtrout · 07-07-2002, 07:08 PM

Non a/c trucks have a valve inside the "doghouse" controlled by a lever on the control panel(middle lever labeled heat) and a cable similar to a manual choke. Good luck and keep on truckin'!----Jerry

07-07-2002, 06:02 PM	#1
Durwood Durwood the Dillweed Join Date: Nov 2000 Location: Kansas City, KS Posts: 156	Heater Valve Woes So, I have an A/C cab with no A/C. All that's left in the engine compartment is the drier. There is no heater valve, as there isn't any vacuum to control it, so the hose goes straight to the core. Even when the fan's not on, that stupid thing is pouring heat into my cab, and it's the middle of summer... What can I do? Do the non-A/C trucks have a manual heater valve or are they vacuum controlled, too? Any suggestions? Thanks! __________________ OleBess :: 69 V8 LWB 3-on-the-tree falling-apart-but-ya-gotta-love-her daily driver

07-07-2002, 06:19 PM	#2
my new 72 faster, faster, faster Join Date: Dec 2001 Location: Houston ,Texas ,USA Posts: 1,354	Take the heater hoses off the Core, and use one of them to loop the system bypassing the core for now, and then figure out what is going on with the switch. Not a fix, just a bandaid to keep you from boiling for now. __________________ I'm going to Law School, wanna debate? It's good practice.

07-07-2002, 06:48 PM	#3
mark25 Registered User Join Date: Feb 2000 Location: Vassar,Ks 66543 Posts: 375	you can go to your local parts store and get a manual shut off valve for your heater that goes in line to stop water flow to the heater core. i had the same problem with the vacuum operated water valve so i put in the manual valve and no more heat in cab!! __________________ '72 C-10 Cheyenne Super, 402/TH400, Bucket Seats, tilt, tach, AM/FM & shoulder harnesses and a ground up restoration

07-07-2002, 07:08 PM	#4
jlmtrout Registered User Join Date: Jul 2002 Location: Memphis, Tn Posts: 194	Non a/c trucks have a valve inside the "doghouse" controlled by a lever on the control panel(middle lever labeled heat) and a cable similar to a manual choke. Good luck and keep on truckin'!----Jerry __________________ '68 c-10 long wheelbase fleetside, been in family since new, originally 250 3 speed Now (389) 350 .060 over 3.75 stroke,Edelbrock Performer RPM 70cc heads and Intake 600 cfm Edelbrock,Small Comp Cams retro-roller cam and roller rockers,9:1 cr, headers, HEI,Old Air a/c, 72 power disc brakes w/stainless lines, 3.42 gear,T-56 6-speed, original paint(what's left of it). Dakota Digital Dash



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