Why does my 88 mustang have heat blowing back into my car when I'm driving? It's like the faster I go the more I can feel it.. But when I stop it don't feel it..
a vaccume controled heater door is moving to heat on position when throttle is open lowering the vaccume needed to hold it closed
That, or you have a hole in your firewall allowing engine heat too come in
It's coming out of my vents tho
In that case, you have a bad heater duct vent.
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