(05-16-2019 )Waterloo Wrote: (05-15-2019 )Lonestar10 Wrote: They do make electric valves for such occasions don't know name but it's similar to what you did only when factory installed as soon as you select AC it shuts then reopens if defrost or normal heat/vent is selected. My truck has a water spicket type valve but I can't use it due to apu so what you posted sounds simple enough to try.
This is the first ruck I have owned that I have had to go under the hood to turn the heater core on and off. All of my other trucks blew ice cold air and heat year round without ever getting under there. This mess of a ProStar, well everyone knows what a garbage HVAC system these are.
Install was easy, everything bolted right up, no need to purchase anything extra, just drain off the coolant pull the spigot valve and replace with this motorized valve. It was an exact fit to what came out, 1/2" NPT.
Wired it up, insured it was working properly and installed switch in dash. Vacuum filled coolant, started truck, and I had heat! Flipped the switch, I had AC!
I spent less than $40 and my time.
I would use this over a solenoid valve. As the solenoid valves need to be babysat. They work with a constant draw of electricity to keep the valve open or closed, forget about it and the solenoid burns up, at least on the ones I have found.
With this unit, to open, flip switch to up to ON position, wait a few seconds and flip to OFF position. To close valve, flip switch DOWN to ON position, wait a few seconds and flip back to OFF position.
I would think as long as the quality of the switch and motor is decent, this should last a while. Finger's crossed.
I have had the same problem....took my truck to the dealer to check wiring...ect. kept telling me thermistor reading was at 34°... Well that wasn't what was coming out of my vents! After replacing a broken actuator and verifying that the doors moved freely but air was still warm. I have used my clamp off pliars to shut off flow to heater core and what do you know....ice cold air! The hvac door must warp or crack. Will be installing these this weekend!
