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AC works on defrost setting only

My AC is not working on any setting but defrost. Warm air blows out on the reg AC settings, but if I turn it to defrost, chilly air comes out. Any ideas?


  • edited April 2011
    That would point to the AC switch or associated wiring. The defrost bypasses this switch on some cars.
  • edited May 2011
    The door that directs the air to either defrost or cabin position is either stuck or motor is dead. This may use vacuum depending on the year. A vacuum leak would cause the door to no move either. My 95 Dodge did this and needed a little motor, $85. My old 77 Chevy did it and I had a vacuum leak. Depends on what you have.
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