Could be a bad fan motor resistor
it could be the blower switch
Why does your ac and heater fan turn off and on
blower fan location on a 1979 lincoln
The ac blower fan is removed with three screws from the under side of the dash on the passenger side.The ac blower fan is removed with three screws from the under side of the dash on the passenger side.
Bad blower motor? Blown blower motor fuse? Bad fan switch? Bad blower resistor pack?
Your AC fan is not working on the maximum setting because you have a bad blower motor resistor. This is located under the dash or next to the blower motor.
The fan switch is probably bad. My Ford Explorer did that, I had to have the switch replaced. This could also be caused by a bad blower motor resistor.
under air cleaner assembly
The fuse for the heater, AC blower on the Ford Explorer is under the fuse box next to the master cylinder reservoir. It is fuse number 36.
it is the moter that spins the fan that blows your heat or ac out of your vents
you access the fan blower by removing the windshield wiper motor from the outside of the car.