Heater Core Replaced, Now Blows Cold Air
I had a leaking heater core replaced on my 99 Winnebago with a Freightliner XC chassis. No more leaks, but now the dash heater only blows cold air. I suspect my local truck repair guy (who knows hea...
Forum Discussion
Vaccuum should open that valve and let the coolant into the core. You can test it with a hand vacuum-pump. You should have vacuum there (can feel it if you put your finger over it) when you're calling for heat.
