I have 96 Lincoln Towncar and a week ago I turned on my deforster and I heard a clicking sound under the dash and it would stop and start again, so today I turned on my heat and it was blowing cold air out. The engine temp stayed the same.
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If this noise is a clicking sound and is coming from the front center of the dash, then it may be the blender door motor which will require removal of the dash to replace it. It will keep the door from switching from heat to a/c. Does the odor smell like you have a freon leak in your a/c evaporator core or does it smell like a rat stuck in your heater and a/c ducts?
The heater and a/c blend door actuator motor is located behind the center of the dash just below the windshield. The steering column must be detached and lowered and the dash must be removed to access the blend door motor.