Originally Posted by
RED DOG
I'm posting to this old thread rather than starting a new one. I'm getting tired of having to replace the heater control valves! I don't need heat. Is there a way to disable the valves from being in the (default) heat position so they can't override the A/C? I was thinking that the valves being in the down position would be the position that shuts off the flow of warm coolant through the system. So was wondering if I put a double spring on the valves to hold them in the down position, might that work? I have plenty of spare parts after changing out the heater control valves FOUR times already. Looking for some advice from the experts! Thanks . . .
If the milder AC temperatures do not use warm air mixed with the cold air you could just cut of the water to the valves, but I think the cold air is mixed with warm air to get the milder temperatures.
The heater core is behind the evaporator so the AC in that case would rely on fan control, the EVAP coil may freeze up in humid areas with no hot or warm air.
That is my thoughts but I am no expert on it.