I know nothing about what heater is in his truck or what was available. My point is as I stated, in MY vehicle it makes little difference whether the valve is open or closed because air only flow across the core with the fan on. IF his vehicle has the same type of heater his experience would likely be the same.

Last edited by Tiny; 06/22/2019 12:14 AM.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.