Heater blower resistor is what controls the low medium high speeds...
A bad heater blower motor resistor would effect one or more blower speeds other than high.
This is not a common failure. The more likely culprit is the blower moter resistor that controls the fan speeds. Very simple to fix yourself and about $35 for the part. To get more info about this or other Trailblazer '02 and up questions join our forum at www.trailvoy.com
If you do not have fan speeds it may be a fuse or the blower motor resistor. For help with the issue visit our enthusiasts forum at www.trailvoy.com
blower resistor especially if its chrysler/jeep or blower switch
the heater fan resister,it is or should be on inside or on outside heater box.
if all speeds do not work id say is a fuse, but if you just dropped one or two speeds. replace the blower motor resister. sells for $60.00 at the dealer.
if you lost one or two fan speeds you need to change the blower motor resister. it sells for around $60.00 at a dealer only.
Resistor on the heater blower motor has failed
If you have no speeds at all, including high speed and you have power at the fuse and the fuse is good, I would suspect the heater blower speed switch and or the electrical plug to the switch is cooked. If you have high speed only and the rest are dead, I would suspect the blower motor speed resistor.
Blower wont work on all 5 speeds, usually the lower speeds tend to go first.
More than likely the blower motor resistor pack is bad, although it can also be the switch itself.
The blower motor resistor is defective. They go bad when the blower motor pulls to much amperage.
You have a relay located behind the glove box once removed to the left and you also have a blower resister that controls the speeds located on the passengers side in the blower motor housing..............
replace the resistor pack on the fanblower, under glowecompartment
Only for the high speed blower function. The lower speeds go thru the blower motor speed resister.
you need a new rheostat !
2002 TB seems to have problems with the blower motor resistor. Its located under the glovebox. Must remove the glovebox door to access it. Parts stores can't keep them in stock! should be about $20 to replace. Also, I believe fuse #35 in the engine compartment fuse block controls the blower on "5" high setting, so check that first. Either the blower motor speed switch or the resistor pack are bad.
Yes, located in the blower motor resistor pack. Follow the wires backward from the blower motor to find it.
If it has only high speed, the blower motor resistor has to be replaced to get all speeds back.
If all speeds do not work, suspect the fuse, the switch, the switch connector or the blower motor. If only high speed works, suspect the blower motor speed resistor. If low speeds work and not high, suspect the blower motor relay.
The blower motor resistor is bad.
Sounds like you need to replace your blower motor resistor.
could be thermostat or heater fan if you can hear all the speeds on the blower motor working then it could be your thermostat but your heater core might be plugged as well
If it works but not on all speeds or is almost making the car stall at idle if you turn the a/c on at a light Than its probably the fan motor resistor pack its $25-$30 at autozone and real easy and fast to replace.