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1974 Plymouth Valiant - 2013 Dodge Dart - 2013 Chrysler 300C
25,580 Posts
There's a simple mechanical door, most likely, unless it's got the auto temp control -- going from memory I don't recall that it does, and it probably does not.

Perhaps the cable or door are sticking... and either going one way or the other.

For a/c, you can alternate between a/c and vent to moderate the temp more efficiently. For heat, well... should get it fixed.
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