heater door on 1990 Nissan 300ZX

heater vent that opens and close to allow heat in the interior of the car doesn't work. How do I replace it? Where can I find the part? Thanks

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2 answers
If you mean the ducts that have louvers on them that fit into the dash they are only available at the dealer or a wrecking yard.If the problem is heater not flowing correctly there are three motors behind the dash that operate the blend doors in the heating and air conditioning housing.
You should get the repair manual from the dealer and the part too, I don't see any other source for the part.