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Re: Why do we have Heater Control Valves? Posted by SWEDECAR [Email] ![]() ![]() ![]() In Reply to: Why do we have Heater Control Valves?, AlS, Thu, 8 Nov 2007 15:02:55 Members do not see ads below this line. - Help Keep This Site Online - Signup |
It's hard to say because we don't know if you are testing it in the proper way.
Hot water is ALWAYS circulating through the heater bypass valve and into the heater core EXCEPT, when full cold is demanded with A/C on. That's when the solenoid is tripped and apply vacuum to the heater bypass valve and it closes the valve so that no hot coolant is lead into the heater core.
If you have no hot coolant running through the heater core under normal circumstances and the heater bypass valve has been replaced, it is a big chance that the two hoses on one side of the valve have swapped positions.
Anders
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