You may want to include make and model, depending on the year some are vacuum operated and so forth. You may get more replies if you include that information, Also simply check the fuse first. If not you can remove the panel and make sure there is power going into the switch, if so next see if there is power leaving the switch. It is a matter of finding where the break in power is...
Your blower switch sensor is out. Replace it!Then all the speeds will work
either the blower control switch or the blower motoer needs replacing
The wiring, switch or blower has failed.
If you are saying the blower motor will not work, then check the fuse. If the fuse is not blown, then it is possibly a defective Blower Motor Resistor Pack, blower motor, or blower motor speed control switch, in that order.If you are saying the blower motor will not work, then check the fuse. If the fuse is not blown, then it is possibly a defective Blower Motor Resistor Pack, blower motor, or blower motor speed control switch, in that order.
did your heater switch go out all of a sudden or did some work like high work and low not work? if some worked your blower resister is most likely bad under your glove box
Blown fuse, bad blower motor switch, blower motor itself, or a defective blower motor resistor pack.
Check the blower motors ground and power in the truck and the blower motors resister......
Bad fuse (open), bad switch or bad blower motor.
Either your switch is messed up, or more likely the blower motor resistor is bad.
Check your radiator fan switch and your fan switch coolant sensor .
You need to replace the blower motor resistor. I've been there done that.
check the blower fuse, temperature sensor on the radiator,switch on the dashboard and the blower relay switch.
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.
If you have no blower speeds at all check the fuse, then check the blower motor switch and electrical plug for a melt down situation, then check the blower motor itself.
There is a relay switch on the back of the main selector switch. If this part goes bad many times the blower will either work on high only or will not work at all. Replace this blower switch, more than likely this is the problem.
Blown fuse? Bad blower motor? see if you are getting power to it Bad blower motor resistor? Bad switch?
The heater blower switch and the electrical plug attached to it may be at fault. Remove the heater control unit from the dash and inspect the plastic electrical plug attached to the blower switch, you may see it has melted. The switch and plug is available from your local auto parts store.
it is probley not the blower switch. if your fan runs on 3,4 and 5 it is your blower motor resister.
Depends on what you mean by heater will not work. If the blower motor will not work, it can be a blown fuse, bad blower motor, bad blower motor switch, or a defective blower motor resistor pack. If you mean that the blower motor works but there is no heat, then it can be a clogged heater core, thermostat stuck open, or defective heater control valve.
blower motor resistor is bad
it may be the switch have it checked out
If there is current going through the wire to the blower switch, try bypassing the switch with a jumper wire. If the blower motor works, then replace the switch. If the blower motor does not come on, then you probably need to replace the blower motor.
have you checked fuses and relays? Yes, I actually replaced the blower motor module & that didn't work. The Blower Motor itself spins freely & there doesn't seem to be any electrical issues. Could it be the Blower Motor speed switch??? If so, is that hard to access?