why would ac in 2003 gallant blow from under dash but not above?

Asked by Apr 24, 2016 at 11:21 PM about the 2003 Mitsubishi Galant ES

Question type: Maintenance & Repair

are there filters that could be clogged or flaps that could be closed or open?

1 Answer

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There are "mode doors" in the dash that direct where the air flows based on what you select via the dash controls. (there's also a "temperature blend door" inside the HVAC box that directs incoming air either across the heater core or AC evap coil.) You may have a stuck mode door, a common failing with them is the actuator, a small module that contains a simple electric motor and gears to move the door. The challenge is to determine which door is faulty, then how to get to it inside the dash - removing the glove box and/or passenger air bag can help in that regard.

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