Coolant Shut-off Valve?
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Coolant Shut-off Valve?
I will be installing a Webasto coolant heater that circulates coolant through the block and heater core. In line between my water pump cover and the heater core there is what looks like a vacuum actuated coolant shut-off valve. Does anyone know the specifics of when this valve is controlled to be open and closed? Could cause problems with my heater if that valve is closed at the wrong time.
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Fleet Mechanic
Joined: Jul 2005
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From: Staten Island, NY
If you remove the heater control valve you'll have hot water circulating through the heater core when the A/C is running. Your A/C will never run at anywhere close to full efficiency.
Fleet Mechanic
Joined: Jul 2005
Posts: 1,464
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From: Staten Island, NY
The heater control valve is a normally open valve, closed by vacuum; therefore, when the engine is off the valve is open. If you have the electronic climate control the valve is controlled by the climate control and will be driven closed to provide maximum A/C. The climate control system monitors ambient (outside) air temperature, inside temperature and solar load. When there is a need for max a/c the valve is closed to keep hot water out of the core.
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Fleet Mechanic
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From: Templeton, Massachussetts
exactly it will be like a lot of GM vehicles..fresh air will be 140*F in the summer..I would not take it out althought you may be able to relocate it if it is in the way..
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