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The blower motor speed resistor is burned out. You can replace only the resistor but the resistor probably burned out because the blower motor is going bad. If you want to fix it for good, replace both the blower motor and blower motor speed resistor.
Check to see if you are getting power to blower motor - if so replace blower motor If not check fuse, switch, resistor pack.
They are generally located close to or near by the blower motor.
Check to see if you have 12 volts at the blower motor. If yes then the blower motor is bad. If no, then the resistor, relay, or fuse is bad.
It is on the evaporator case and is held in with 2 screws.
To replace a blower motor on the resistor first you take off the nozzle and then you go into the motor through the nozzle and unlock it then repeat and oil and done.
Blown Blower Motor fuse, defective Blower Motor Resistor Pack, or a defective Blower Motor.
On the evaporator case.
# Locate the blower resistor under the right-side of the instrument panel # Disconnect the electrical connector from the blower motor resistor # Remove the blower motor resistor mounting screws and remove the resistor from the housing # Installation is the reverse of removal
check the blower motor resistor
replace the blower motor switch
you need a new blower motor resistor with auto temp control