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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With engine running a few minutes, feel both heater hoses to see if they get hot. If not, no or little coolant flow. Possibly the vaccume controled valve you mentioned.
If both hoses are getting hot, likely the blend door is not operating, possibly bumped off during the repair.
If both hoses are getting hot, likely the blend door is not operating, possibly bumped off during the repair.
