My heater on my 01 1500 Sport Off-Road after replacing the blower only work on the 2 high positions. Why is this? Both low positions do not work, how do i fix this??

 

Replace your blower motor resistor and that should fix your problem, it is under the dash by the blower motor, it should be 2 screws holding It in and a plug... Hope that helps

 

before you replace it, remove the old one and inspect it. a friend's dakota burned out on one of the speeds, but there was a sort of bus bar with an alternative connector/resistor. i can't remember exactly what he did, but it was as easy as move a wire and it was good to go.

the resistor is just a variable resistor. on the high speed setting, 12v is connected to a terminal with zero resistance, so the blower motor runs at full speed. for each fan speed, it connects 12v to a different terminal with increasing resistance which results in lower voltage and slower speeds. when a resistor burns out, then that speed quits working.
http://www.autozone.com/autozone/par...362031_0_3330_


what was your problem before replacing the blower motor?