Sounds like the blower motor resistor. I just had the same problem in my '94 Grand Cherokee. I went to the scrap yard and got the same part for $20. The dealership wanted $200.
Sounds like blower motor module resistor
the resistor for the blower motor is busted blower works on high with out it
Bad resistor at the blower motor? Bad blower motor switch?
replace the blower motor switch
The blower motor fuse protects the blower motor electrical circuit. The blower motor relay operates only the high speed function of the blower motor. The blower motor speed resistor operates the lower speed functions of the blower motor.
It should do.
A blower motor that only works on high is normally caused by a defective Blower Motor Resistor Pack. DRL, do not have a clue.
from what i have read it is the blower motor resistor it goes bad and only lets the fan run on high google blower motor resistor and read on
The blower motor resistor has failed.The blower motor resistor has failed.
When you beat the blower motor, you are probably shaking the blower resister. The resister is what controls the blower speeds and is probably bad or loose.
Blower motor control?