Fan Noise, Nissan Altima

Asked by Dec 09, 2015 at 11:22 AM about the 1996 Nissan Altima

Question type: Maintenance & Repair

Hi, I have a '96 Nissan Altima, and this morning a loud rhythmic clicking sound
started coming from the fan when I turn it to the windshield setting. What
could this be?

2 Answers

24,795

"windshield setting?" Is that the defroster setting? (sorry I've never owned a Nissan). All cars have what are called "mode doors," which direct just where the AC/Heated air is directed via the vents. The mode doors themselves are moved by "actuators," which are small plastic gear boxes and little electric motors. Chances are your actuator for one of your mode doors is broken and the clicking you hear is it trying to move the door but it's just grinding it's little plastic gears. A little troubleshooting will help you isolate which actuator is the problem. Google mode/blend doors for your make/model for diagrams of your dash's layout. Then be prepared for the task of actually swapping out the bad part, as getting to these actuators can be tricky.

Thanks.

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