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Heater Fan Not Working

A heater fan that does not work at any speed usually has a blown fuse, a failed blower motor, a faulty resistor or module, a bad relay or a switch or control panel fault.

Normal risk

Get it fixed soon. Without the fan you cannot demist the windscreen properly, which is a safety problem.

Short answer · Why is my heater fan not working at all?

The blower needs power through a fuse and relay, and a speed control. If nothing happens at any speed, check the fuse first. A worn motor can seize; tapping the housing sometimes makes it run briefly, which confirms the motor. On climate control cars, a failed module or control panel can stop the fan. Leaves in the housing can also jam the fan.

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Safe checks you can do

  1. Check the fuseUse the handbook fuse plan.
  2. Listen for any soundA hum without airflow suggests a jammed fan.
  3. Check the pollen filterA blocked filter reduces airflow but rarely stops the fan.

Questions that narrow it down

  1. Did it stop suddenly?Fuse, motor or relay.
  2. Was it noisy before?Motor wear.
  3. Did it only work on high before?Resistor or module.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Blown fuseQuick check.
  2. Failed blower motorNo sound at all.
  3. Faulty resistor or moduleNo speed control.
  4. Bad relayNo power to the motor.
  5. Control panel faultClimate control cars.

Questions about Heater Fan Not Working

Can I drive without the fan?

Yes, but the windscreen may mist up; fix it before cold or wet weather.

Is the motor hard to replace?

It depends on the car; some are behind the glovebox.