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I am gonna assume its a older maxima 1995-2001??maybe?? those had some harness issues. also there is a small drain tube for a/c drain, which clogs up and water has nowhere to go after evaporator box fills up. after that happens, the water will run on top of the ECM/computer and will flood it and fry it. need more info. not 100%sure what model year it is.
Turn off ur car before u work on replacing any fuses. Find the main fuse box by looking under the hood in the engine compartment.----------------------------------------------------------------------------------------- Car Key Programmer
its the blower motor resistor that is faulty or the blower motor resistor wire connector that has a bad connection.Wiggle the wire connector going to the resistor with the ignition switch and the fan switch in the on position and if the fan comes on then the connection is bad but, if it does'nt come on then the resistor is faulty.
Your friend is right. To answer your other question these are two totally seperate fans but that does not mean that one fans fuse or relay did not affect the other. You should check your fuses and which ones, if any, are blown. It is likely that during your radio installation a bare contact touched something and blew the fuse(s). If the fuse is blown and, when you replace it and work your heater fan, it blows again then chances are your radio may have cut a wire upon sliding it in. Reply back to this post and let me know.
My AC quit all of a sudden and it was a switch in the ac line. It was located on one of the air conditioner lines almost next to the firewall. Looked like a little box. When the p/u was running and the ac was turned on, I tapped it with a screwdriver handle and the ac compressor came on. I think it was a low pressure switch and is supposed to keep the ac from running without any freon, so you might try that. Best of luck.<!-- from fixya rte -->
It has to be a fuse. Check the maxi fuses under the hood. Also, check each fuse individually wherever there's a fuse box. If there's a blown fuse, then you have a short in the cigarette lighter and you will have to get the car serviced.
I had this same truck but don't remember which fuse right off hand. The heater motor uses one of the heaviest fuses in the box though. Start checking your biggest amperage fuses and work down from there. If the fuses are good and if you can locate the motor leads you might be able to bypass the fuse box by connecting it to a battery or jump box. This will tell you if the motor is good. Don't let the motor run without the fuse though. See if it turns and IMMEDIATELY disconnect it from the battery/jump box. We're only seeing if we can get a reaction. The motor only needs to come on. Don't let it STAY on. Don't run your heater without the fan. It can destroy the heater coil and that's bad news.
Take the glove box out. Behind the fuse box you will find a big gob of black tape, (it looks like a box shape all taped up. Take the tape off and you will find three inline fuse holders taped together. The AC fuse is the 10 amp one.