Heating & A/C Ducting - Questions

[Theberrys]

In the front outside just over the generator on the bulkhead is a vacuum pump for the dash air. You should hear it running when you first turn on the ignition. If it's not running or a hose has come off or has a hole in it the flaps directing air will not work.
Dick

[DKStall]

Originally Posted by Dragracer_Ro

My coach, (and many older big trucks I've worked on),have a valve back at the engine that shuts off the coolant flow to the heater core at the front of the coach.

That's a great tip. Thanks! I'll poke around (front and back) and see what I can find.

[greg6746]

Originally Posted by Theberrys

In the front outside just over the generator on the bulkhead is a vacuum pump for the dash air. You should hear it running when you first turn on the ignition. If it's not running or a hose has come off or has a hole in it the flaps directing air will not work.
Dick

Thanks for this ! Mine just stopped working and I was suspecting the vacuum pump. I haven't had a chance to explore and now I don't have to !
Thanks again !!