- Blown fuse: Check the fuse box inside the vehicle for a blown fuse. If a fuse is blown, replace it with a new fuse of the same amperage.
- Faulty relay: The heater fan relay may be faulty, preventing power from being supplied to the heater fan. Check the relay by swapping it with another relay of the same type. If the heater fan starts working, replace the faulty relay.
- Faulty heater fan switch: The heater fan switch may be faulty, preventing power from being supplied to the heater fan. Check the switch by turning it on and off. If the heater fan does not start working, replace the switch.
- Faulty wiring: There may be a fault in the wiring that supplies power to the heater fan. Check the wiring for any damage or loose connections. Repair or replace any damaged wiring as necessary.
- Faulty heater fan motor: The heater fan motor itself may be faulty. Check the motor by applying power directly to it. If the motor does not run, replace it.
Note: If you are not comfortable performing these checks or repairs, you should take your vehicle to a qualified mechanic for diagnosis and repair.
