Car Heater Fan Switch Not Working

Checked continuity of 40 amp blower fuse.

Car heater fan switch not working.

The only fault that is likely to develop is that the fan stops working because of a break in the electrical circuit. Blower still does not work. So it s advisable that you get the switch checked too. The motor is usually earthed to the body by a separate wire.

The system is very simple and rarely goes wrong. 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. Rotated all the pdc relays around they have the same id other than abs pump. Follow the wiring harness as carefully as possible between these two locations looking for burned out spots or breaks in the wire.

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. This symptom reveals the aging weaknesses in the resistor that usually makes all the magic happen. A problem with the switch which turns the fan on or off might also be the source of the problem. 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 unmarked relays around in the junction box. There is no battery to operate the blower. A blown fuse might just be the reason your car heater fan is not working.