The heat in my blazer only blows cold air unless
I'm on the highway then it works fine. Don't want
to but my parts until I know what to get. Any of you
know what I should do?
Sound like it is low on coolant.
I thought so to but I filled it 2 days ago and it is still full.
There are a couple of things, first does this Blazer have AC?
Yes and it works fine.
There is a AC Panel Mode Door Actuator that looks like it is vacuum operated that may have a bad vacuum line running to it or its just bad, and there is a AC,Heater Vacuum Check Valve you may want to check out.
Okay I'll check it out.
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