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Message: <blockquote data-quote="bump - N - ugly" data-source="post: 4009846" data-attributes="member: 585692"><p>Have you checked the linkage that opens the flap/ valve that allows the coolant to ciculate through the heater core? Get someone to move the heat/cool back and forth and see if  the flap opens and shuts. Some are mechanical - a small caable, some work off a vacuum. Could be a bad cable or vaccuum leak. Vacuum only works with car running!! I had this happen and the problem was under the dash were the vacuum lines come out of the controls for hot/cold. Mine was stuck wide open on Hot I live in Texas and that sucks in the summer!!!</p></blockquote><p></p>

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