98 4.6 heating question
#16
Originally Posted by livisdaddyf150
My 97 has the same problem...I've found if I hit a few potholes after warm up, the heat usually comes on due to the blend door jarring shut. Its like there isnt quite enough vacuum pressure to close it due to it sticking or something, but the vibration of the potholes causes it to unstick and close.
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