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Old 05-22-2002, 04:13 PM
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Question Heater control valve question

My '53 F100 originally had a pet**** on the manifold to shut off the water to the heater core in the summer. Well, here in the new mellenium we have dumped the Y block and upgraded to a SBC 350. I went to the bone yard and got a vacuum operated inline shutoff valve out of a Buick Regal and I put manifold vacuum to it for the summer. Before I installed it, I checked it, cleaned it, painted it, and tested it, so I know that it works. I also verified that the valve is installed in the correct direction of flow because the valve has an arrow on it. I installed it on the supply side of the heater core to stop the water supply. My problem is, the heater core still heats up and warms the cab! If I turn on the blower, the heater core cools off right quick which means that I have a little flow but not much. Do you think that it would make any difference if I installed it in the return side? HotRod

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Old 05-22-2002, 07:52 PM
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How big is you cam? does the heater come on after you floore it? you may be losing vacume or it could be that the heat is convecting up the heater hose the cool water in the core is heaver than the hot water in the motor so the cold water will naturally try to go to the lowest spot it can find.
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Old 05-23-2002, 03:15 PM
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The cam is stock and I have watched the valve, it appears to be staying closed. The heater hose is coming off of the water pump and goes to the valve, then into the bottom inlet of the heater core, out of the core and returns to the top of the manifold. Once the heater is warm, it stays that way unless I turn on the blower and disipate the heat. Once the blower is turned off, it will warm up again.

[ May 23, 2002: Message edited by: HotRodF100 ]</p>
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