2003 Nissan Altima Heater/AC knob is stuck on ac...
The knob for the ac/heater is stuck on ac how do i get it back to heat? i pulled the front "plate" off and see a little "arm" my wife said her friend fixed it when it was stuck on heat and the guy moved "the" arm to get it on air conditioning...its startig to get cold out side...someone help please! Thank you
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Check to see if blower is working by running 12v to it. If that works check if your heat/ac controls are working by looking at the area where the flaps are and turning the knobs/buttons. You should hear the flaps move or see the pins of the flaps turn. See if your heater core is working. Should be hot as coolant from engine passes through it.
The sliding switch on the console is stuck in the cold position and the knob is pulled off. Use pliers to jiggle the switch as best you can. Feel under the center console and you probably will find the cable that is hooked up to the flapper. You'll know because when you jiggle the cold/heater switch at the upper console, the cable will move slightly. At the hookup of the cable to the flapper down under the console (passenger side) try to work the flapper loose to the open (or close) position. At the same time work the sliding switch (with pliers). The flapper will come loose and function properly. Try not to knock of the AC button like I did in the process. It flew off some where under the passenger seat. I'll find it sometime before summer. Ha.
problem could be in the mode switch + check fuse to heater and ac mode switch.if blown your air door wont open and let heat enter inside car.if fuse look good you could have faulty mode switch.if you have climate control if you have a bad in vechicle sensor that will effect air door to open let heat in.this problem would be best for dealership.if dealing with climate control units.you need a quick fix.too cold outside not to have heat in car.
I've had mice in my Nissan PU and actually caught one in a trap set on the floorboard; so I know they can get inside. They also knocked some of the fiberglass insulation into the blower motor so it vibrated as it was no longer balanced. You could have a dead one in your blower. Mine was easily accessible from under the passenger side under the dash. Three screws and the motor dropped so I could clean out the fiberglass.