My wife's Pacifica with 130k miles, suddenly lost it's heater. When the car is warmed up and you turn on the heater, it comes out hot, for a minute or so, then slowly switches to cold air. You have to turn it off for a few minutes, then back on, to get it to go back to heat, but then goes back to cold after a minute. With winter fast approaching, I'm concerned for her ability to defrost the windshield. Any ideas?
Under the dash there are doors that open and close to give you hot or cold. Sounds like you have a vacuum leak in a hose or one of the vacuum motors that moves the door I would hook up a cheep hand held vacuum pump to each one and see if they hold vacuum also the one that opens the door that keeps the heat blowing is the one to look at if the door stays open and you have heat with the hand pump and you don.t have to keep pumping it the hose or farther back is leaking.
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