Why does my blower only work on the highest speed?

This is the classic sign of a failed blower resistor. The resistor reduces voltage for lower speed settings; when it fails, only the direct full-voltage connection (high speed) remains functional.

Is it safe to drive with no blower?

You can drive short distances but windscreen demisting is severely compromised in cold or humid weather. This is a significant safety concern — repair promptly.

Can I replace just the resistor instead of the whole motor?

Yes, in most cases. The resistor is a separate, inexpensive component that clips into the blower housing. If the motor itself runs smoothly but speed selection is limited, start with the resistor.

What causes the blower motor to burn out?

Prolonged operation with a failing resistor, debris jamming the fan wheel, or a blocked cabin pollen filter that makes the motor work harder than designed are common causes.

How long does it take to replace a blower motor?

On most vehicles the job takes 30-60 minutes. Remove the glovebox, disconnect the connector, unscrew the motor, and reverse. Some vehicles require more dashboard disassembly — check a vehicle-specific guide.

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Heater Blower Motor buying guide — what to know before you buy

The interior blower — also called the heater blower motor — circulates air through the cabin heating, ventilation, and air conditioning system. When it fails, you lose demisting, heating, and conditioned airflow, making the cabin uncomfortable and reducing visibility in cold or wet weather. Faults range from a completely dead blower to a motor that only works on certain speed settings due to a failed blower resistor. Valeo, Mahle, and Hella supply replacement blower motors and resistors for a comprehensive range of vehicles. The blower is usually accessed from behind the glovebox or under the dashboard — a straightforward job on most platforms.

Diagnosing interior blower problems

Before replacing the motor, identify whether the fault is in the motor itself, the resistor pack, or the control switch. This avoids unnecessary parts purchases.

No airflow on any setting: motor failure, blown fuse, or faulty relay
Works on high but not low speeds: resistor pack failed (most common cause)
Noisy blower (grinding, rattling): worn motor bearings or debris in the fan housing
Intermittent operation: faulty electrical connector or motor brushes near end of life
Burning smell from vents: motor overheating — replace promptly

Blower resistor versus blower motor

The resistor pack controls fan speed by varying the voltage supplied to the motor. It is far more commonly replaced than the motor itself. Always check the resistor first — it is usually clipped into the blower housing and takes minutes to swap.

Resistor cost: typically £10-£30 for most vehicles
Motor cost: typically £30-£80 for most vehicles
On vehicles with electronic climate control, the speed module may need coding

Replacing the blower motor

Disconnect the battery before starting to avoid accidental airbag deployment. Remove the glovebox or lower dashboard trim to access the blower housing. Unclip the electrical connector, remove the retaining screws, and withdraw the motor. Transfer any foam seals to the new unit and reverse the procedure.