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Ask Your Question2004 Ford Explorer
Question: why does my a/c flow move from vents to defrost when I accelerate?
Question
hillbrenda95, New Braunfels, TX, July 04, 2011, 13:58
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when I reach 40 mph, the air flow moves from the vents to the defrost; when I slow down, the airflow returns to the vents.
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Answer #1
David J from Johnson's Automotive, July 06, 2011, 09:42
EnthusiastThe mode doors which control air flow are vacuum operated. You truck more than likely has a vacuum leak. This could be anything from a pinhole in a line, a leaking actuator or cracked vacuum reservoir.
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hillbrenda95, July 06, 2011, 11:29ReplyRookieThank you so much, David J!
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