The heater does not work on our 2000 Nissan Maxima. The fan blows air..but no heat. What could this be and what could it cost for repair?

check for a stuck open coolant valve to the heater core. check for an air flap that is stuck open too . thanks.

check you antifreeze level, if its low you may not get any heat. other then that it can be vapor locked (not great if it hasn't been emptied and refilled recently , could be a bad head gasket) or it can be the control in the dash...if so you may hear what sounds like an air leak(losing vacuum) or the air doors may be stuck towards the cold.......I hope your antifreeze is low, the other things are a pain to fix usually

If the engine is heating properly you most likeliy have a clogged heating coil or regulator (opens to allow hot water to flow thru the heater core. No hot water to the heater cord, not heat in the vehicle. Good luck

First ,You will need to check that the condenser fan/rad fan, comes on when AC is selected, and is operating at proper speed. It sounds like it may not be.

It's time to replace the blower motor, bearing in blower motor have gone bad.

If no air is blowing out the vents at all, your blower fan motor could be bad.

heater tap not opening dont know if its electric or cable but cable is easier to check visually look under hood to see little tap connected to heater hoses and cable,if electrically operated you may need to go inside the dash but check external stuff first

Had same problem. Replace Blower Motor. Over a 100 dollars at local parts store, but found online for half price. About 30 minutes to replace. http://www.rockauto.com/catalog/raframecatalog.php?carcode=1431961&parttype=6916
6 screws to remove glove box, One plastic nut on kick panel and 3 screws hold the blower to the air box.

I have a 2002 nissan Maxima. The AC controls only blow on level 4. No air or heat blows from level 1-3. What do I need to do to repair this problem?

the a/c condenser has a fan in front ( there is actually 2 fans if you sit on the car it will be fan on right side ) if this fan does not
come on immediately when you are parked and engine in idle
there is a problem with power to it, or motor failure. If you drive it
on the highway and a/c operates fine that's because air is circulating though condenser (thats what the fan is supposed to do at idle or slow traffic)