[Nissan-MasterTech]

The evaporator is just in front of the of the cabin filter, with the filter removed you can almost touch it .

The previous owner must have run the AC on recirculate the majority of the time. That is a no-no .

Running it on recirculate does not let any fresh outside air over the evaporator , the system just keeps using the damp interior air over and over . This can and will cause mold to form and odors too.


So here is what you do.

1. remove the micro filter and install the door.
2. get a can of Lysol mold and mildew spray.
3. start the car, fan speed on high , with the system set to fresh air not recirculate.
4. at the base of the windshield on the passenger side you see the lower windshield cowling, it has holes in it.
5. spray about 1/3 of the can through those holes, the spray will get sucked into the HVAC system and across the evaporator.
the lysol will begin to kill the mold spores.

repeat the process again in a few days until the can is gone.

Run the system on fresh air as much as possible, if you are in traaffic and the exhaust odor is too much put it on recirc but return it to fresh when you can.

Hope this helps.