The heater fan is behind the glovebox. If you remove the glovebox and look up from underneath, you'll see the blower motor. It is held on by three screws. In front of it the blower motor resistor, which also sometimes goes bad.
try changing the fuses for the blower or maybe the motor blower itself or the blower resistor.....................
check the blower motor resistor
if your blower motor is not properly working it is most likely your blower motor resistor. it is located next to the blower motor which can be found by looking through your glove compartment. 17.99 at your local autozone
the heater blower is located under the dash on the passenger side. easy to change ,4 skrews.
Defective Blower Motor Resistor Pack.
it is underneith the passanger dash above the black panel under the dash behind the blower motor
Most of them are visible if you drop the glove box door.
It is on the evaporator case and is held in with 2 screws.
IF YOUR TALKING ABOUT YOUR A/C OR HEAT, YOU HAVE A DEFECTIVE BLOWER MOTOR RESISTOR
Blown blower motor fuse? Bad resistor pack at blower motor? Bad fan switch?
Blown blower motor fuse? Bad blower motor or resistor? Check to see if you are getting power to motor - if so motor is bad if not check fuse and/or resistor Bad switch?