The motor that runs the fan in the heating and air conditioning system in a car is called a blower motor. It’s located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall.
How do you diagnose a bad blower motor switch?
Symptoms of a Bad or Failing Blower Motor Switch
- Switch only works on certain settings. One of the first symptoms commonly associated with a bad or failing blower motor switch is a switch that only works on certain settings.
- Switch is stuck.
- Broken knob.
How do you change a blower switch?
How to Replace a Blower Motor Resistor
- Step 1: Remove the glove box door, if necessary.
- Step 2: Disconnect the wiring harness and remove screws.
- Step 3: Remove and replace the blower motor resistor.
- Step 4: Tighten screws and reattach wiring harness.
- Step 5: Reinstall the glove box door.
How do I know if my AC fan switch is bad?
The best way to tell if your cooling switch is faulty is to listen to your engine while you drive. You know how your engine is supposed to sound, and if you notice that you don’t hear the fan as often as you normally do during your afternoon commute, you might have a failing switch.
How do you test a blower switch?
Test the switch. Plug the connector back in to the blower motor, and then trace the wire harness back to the connector closest to the blower motor switch, usually located under the dash. Disconnect the connector and set the multimeter to ohms.
Do you have to replace the blower motor and resistor?
There is still a chance that the blower motor control could be faulty, but if the control knob feels good and all the fuses and relays are good, chances are you need to replace the blower motor resistor. Burned-out blower motor resistor pulled off a 2004 Ford E250 van.
