Car Heater Fan Switch Not Working

This symptom reveals the aging weaknesses in the resistor that usually makes all the magic happen.

Car heater fan switch not working.

If any of these not so great for your car tricks gets your heater back to proper function this is a big indication that it s your heater switch that s on the fritz and causing your current cabin temp woes. The system is very simple and rarely goes wrong. Blower still does not work. Follow the wiring harness as carefully as possible between these two locations looking for burned out spots or breaks in the wire.

So it s advisable that you get the switch checked too. There is no battery to operate the blower. Checked for battery at the blower when the car is running. Look for a break in the wiring between the switch and the fan if the meter shows voltage or the light illuminates and you have tested the switch and motor.

Rotated all the pdc relays around they have the same id other than abs pump. A problem with the switch which turns the fan on or off might also be the source of the problem. Blower still does not work. The only fault that is likely to develop is that the fan stops working because of a break in the electrical circuit.

Checked continuity of 40 amp blower fuse. Rotated all the unmarked relays around in the junction box. Check for blown fuses and replace them to restore normal functionality.