Need help Heater control valve leaking coolant
#1
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Need help Heater control valve leaking coolant
hi i have a 93 lexus sc400 and the heater control valve is leaking coolant it does not affect my heat or a.c but i would always have to refill up the coolant into the reservoir and coolant tank i have heard some people replace the solenoid and the leakin was gone or would i have to just replace the whole aasebly anyone help or thoughts thanks
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#11
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Personally, I dont think so. I can still get cold air if I want, so I dont see the harm in letting coolant circulate. I think its probably better than letting the coolant stagnate in the lines and heater core, but I dont have any kind of data to prove or disprove the theory.
#13
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Coolant loss was minimal for me. I stuck the fitting in, and had enough in the rad overflow for it to bleed itself after a couple heat cycles. Just add a splash of coolant or distilled water to the overflow if you lose more than a dribble of coolant. It will pull what it needs from the overflow.
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so I can take the valve off and just connect the hoses together ? Will I still have a.c. and is there more to it or just that
#15
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You will still have A/C yes. You just won't have any heater function when the HVAC controller attempts to bring in more or less heat via the VSV and vacuum controlled actuator that connects to the actual plastic valve.
It's still better to get an OEM replacement if available or to replace the OEM design with an (apparently now discontinued) Four Seasons/Everco #74636 valve which requires just a little Dremel shaving on one side and the little arm swapped from your original valve to fit in just like factory... but with that aftermarket valve gone from circulation now there are other DIY alternatives to replacing the heater control valve and getting the HVAC to control it. There is a big thread on that somewhere here.
But yes for right now you can just get an appropriate size coolant hose coupler and two screw clamps to bypass a bad HCV valve entirely for the time being.
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