Car Heater Fan Switch Not Working

Follow the wiring harness as carefully as possible between these two locations looking for burned out spots or breaks in the wire.

Car heater fan switch not working.

The system is very simple and rarely goes wrong. A blown fuse might just be the reason your car heater fan is not working. Checked continuity of 40 amp blower fuse. Blower still does not work.

So it s advisable that you get the switch checked too. 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. 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.

A problem with the switch which turns the fan on or off might also be the source of the problem. Rotated all the pdc relays around they have the same id other than abs pump. Rotated all the unmarked relays around in the junction box. Checked for battery at the blower when the car is running.

The motor is usually earthed to the body by a separate wire. Check for blown fuses and replace them to restore normal functionality. 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.