The defrost has stopped working it blows out the main dash vents only when fan is turned on.
The directional door or actuator thereof is inoperative. This door moves when you choose a vent at the selector, and directs the air to the desired vent(s.) When the actuator goes bad, loses vaccuum, or an electric door motor fails, the air will go to a default position that is usually the defrost. Since you are stuck at the dash vent position, closer inspection at the door itself is required. Could be a stuck door or actuator; or less likely, a faulty controller. Good luck, let me know if you need more info. THanks, TT
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