I also have the same problem. Did you find where it is? So I have to replace it...Suspect my heater control valve is bad. No heat all of a sudden. No overheating or leaking. No antifreeze smell. My question: Where is the valve located ?? Is it under the passenger side dash or under hood? Please help!!
thanks a lotThe magnetic valve thats in the front left wheel well controls the flow of hot engine coolant to the heater core. It's either fully opened or closed, it is not PWM. You could check HVAC -08 with VCDS for codes. After running the engine for 5-10 minutes, you should be able to feel all 4 pipes are hot/warm. If the lower 2 are hot and the upper 2 are cold, then the valve is closed. If all 4 pipes are warm, your issue lies with either a stuck blend door, or plugged heater core.