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.

Car heater fan switch not working.

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. Blower still does not work. This circuit consists of a feed wire from the fusebox to the on off switch on the dashboard or centre console and another wire from the switch to the heater motor. The only fault that is likely to develop is that the fan stops working because of a break in the electrical circuit.

This symptom reveals the aging weaknesses in the resistor that usually makes all the magic happen. Rotated all the pdc relays around they have the same id other than abs pump. Checked for battery at the blower when the car is running. Blower still does not work.

A blown fuse might just be the reason your car heater fan is not working. The system is very simple and rarely goes wrong. There is no battery to operate the blower. Rotated all the unmarked relays around in the junction box.

Follow the wiring harness as carefully as possible between these two locations looking for burned out spots or breaks in the wire. Check for blown fuses and replace them to restore normal functionality. Checked continuity of 40 amp blower fuse.