My 2007 Nissan Quest's front heater fan no longer works. I checked the fuses (in the main engine compartment) and they are fine. Where is the fan anyway? Is it located deep under the dash..can a common guy find it and replace it if need be? Or is there something else that could be wrong?. The rear fan is working fine.

SOURCE: 1994 nissan quest crankshaft rear main seal removal

There is no other way other than to remove the engine.I now its a lot of work but if you want to do the job properly then thats the way to do it.You can remove the gearbox and try.I think thats a waist of time good luck.

SOURCE: I need to replace my Nissan Quest 2007 in cabin micro filter

I'm going to send you exploded view of the glove box and the in cabin micro filter cover illustration. Remove the two upper screws on the glove box and carefully pry metal clips loose.
Disconnect glove box lamp electrical connector. Do not let glove box assembly hang from glove box lamp harness.
Remove three lower screws and remove damper clip from glove box door. Separate glove box housing and passenger instrument lower panel.
Remove three screws and remove in cabin micro filter cover.
Remove in cabin micro filters from front heater and cooling unit assembly.
Note When installing two new in cabin micro filters ensure that the filters are facing in the direction indicated by the direction arrow for the airflow. Direction arrow is printed on side of in cabin micro filters.
Install in cabin micro filter cover. Reinstall glove box.

Testimonial: "Finaly I found the air flow door with three screws and removed it. The filter will need replacement soon. It is been replaced one time at the dealer."

SOURCE: how do I change an air filter on an 2007 nissan

This particular model does not come equipped with a Cabin Air Filter.

Testimonial: "thanks but the manual said it does "