Car Heater Fan Switch Not Working

Rotated all the unmarked relays around in the junction box.

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. Blower still does not work. The system is very simple and rarely goes wrong.

So it s advisable that you get the switch checked too. This symptom reveals the aging weaknesses in the resistor that usually makes all the magic happen. Follow the wiring harness as carefully as possible between these two locations looking for burned out spots or breaks in the wire. A problem with the switch which turns the fan on or off might also be the source of the problem.

Checked for battery at the blower when the car is running. Checked continuity of 40 amp blower fuse. 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. Rotated all the pdc relays around they have the same id other than abs pump.

The only fault that is likely to develop is that the fan stops working because of a break in the electrical circuit. Check for blown fuses and replace them to restore normal functionality. The motor is usually earthed to the body by a separate wire.