I have heat on the passenger side but not the drivers side. Can you help me out? on 2005 Mercury Mountaineer

This just happened this morning. Had good heat yesterday and no problems til now.

Asked by for the 2005 Mercury Mountaineer
There is a blend door motor on the pass side of the vehicle which varies the hot and cold air. this motor has quit working, most likely the plastic gears inside the blend motor. it will have to be replaced with a new unit.
these are available through most parts houses.
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