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...
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My HVAC also has a water shut of valve with a vacuum line going to it like in the picture. On my HVAC it turns the coolant flow off to the HVAC only when you put the Unit on Max AC. Other than that it has no effect on the heat. I would determine what it does before I disconnected it.
