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#1 |
Registered User
Join Date: Jul 2008
Location: Tracy Ca
Posts: 171
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Water Valve Heater
Not sure if I have my heater hoses run correctly and if I have the water valve on the proper hose. I have A/C it is a "Four Season System" 1972 1/2 ton factory air.I have one hose from intake manifold to heater core and one from the top of radiator to core. The water valve is on hose from radiator. I think I have hot water in heater core all the time. Anybody know the correct configuration for this??? Auto trans 350 engine Thanks for the help. Gets real hot in the cab during these summer days!!!
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#2 |
Moderator
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Location: Southern Cal
Posts: 20,006
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Re: Water Valve Heater
Do you have the vacuum hose connected to the heater valve? Vacuum has to be applied to the valve to close it and prevent coolant from circulating thru it. Your rad. hoses sound like they are routed properly.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man Last edited by leddzepp; 09-10-2010 at 11:56 PM. |
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#3 |
20' Daredevil (Ret)
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Location: Jefferson State
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Re: Water Valve Heater
I can check my truck's hose routing in the morning if there's still any question.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#4 |
Registered User
Join Date: Jul 2008
Location: Tracy Ca
Posts: 171
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Re: Water Valve Heater
Yes I am getting vacuum to valve. I was concerned I had hose routed wrong.
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#5 | |
20' Daredevil (Ret)
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Location: Jefferson State
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Re: Water Valve Heater
Quote:
The odd thing is that with different size hoses, the valve will only fit on the 5/8" hose, yet yours is on the hose from the radiator.... which on my truck is 3/4".
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#6 | |
Registered User
Join Date: Jul 2008
Location: Tracy Ca
Posts: 171
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Re: Water Valve Heater
Quote:
From top of core to top of radiator... From bottom of core 3/4 to valve out of valve to 5/8 connecting to intake. What is the direction of water circulation??? The problem I am having is the vacuum logic is not matching what the heater control is set at. I get hot water through my core when I should not have flow. Could my vacuum VALVE ON THE CONTRILLER IN MY TRUCK BE PLUMBED BACWARDS?? Sorry for the caps hit the wrong key... |
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#7 | |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: Water Valve Heater
Quote:
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#8 |
20' Daredevil (Ret)
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Location: Jefferson State
Posts: 13,648
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Re: Water Valve Heater
Looking at the valve, the pipe pointing straight away from it goes to the heater core. The curved pipe connects to the intake manifold.
Water flows from the intake manifold to the valve -- from the valve to the lower port of the heater core -- from the upper port of the heater core to the radiator.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#9 |
Registered User
Join Date: Jul 2008
Location: Tracy Ca
Posts: 171
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Re: Water Valve Heater
Thank You Stocker for that very clear explanation. That is the way I have mine setup. Next step is to check vacuum control from controller in truck.
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#10 |
Moderator
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Location: Southern Cal
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Re: Water Valve Heater
This is also correct. Check and see which one you have, the 71/72 valve should close with vacuum applied.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#11 |
Registered User
Join Date: Jan 2009
Location: Sandersville, GA
Posts: 298
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Re: Water Valve Heater
I had a similar problem on my 72. I bought a new valve and installed it. Still hot in the cab. Finally found a vac hose loose under the dash. Reconnected it and things got a lot cooler. AC was running the whole time, it was just mixing hot air with it. Maybe this will help.
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How 'Bout them Dawgs! ![]() '10 Traverse LTZ 03 Silverado Z71 ext cab 99 Yamaha Grizzly 600 72 C10 350/350 sportside bed. 68 C30 flatbed. 350 4-speed. "I've got a good memory, it's just short!" |
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#12 |
Registered User
Join Date: Jul 2008
Location: Tracy Ca
Posts: 171
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Re: Water Valve Heater
That could be it. I will check to see if I have the correct valve. I bought it from LMC but they could have mixed them up!!
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