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The blower motor controller is located in the engine compartment. It is responsible for controlling the engine blower motor and the auxiliary footwell duct motors.
The typical repair price range for the blower motor control controller / relay is is £240 to £350GBP (exc. UK VAT) depending on what we discover during testing. We’ll let you know after test & diagnosis if the repair price is likely to exceed the lowest price stated above.
Turnaround time is 10 to 15 business days plus return shipping time. International customers welcome. More details here.
For more details regarding common faults and repairs with the blower motor controller, please see ‘Additional Information’ on this page.
We are here to help, so if you have any questions, please contact us.
Porsche 911 (1983 - 1989) blower motor controller/relay repair service
The blower control unit contains 2 relays. A 25A relay is responsible for switching power to the main blower motor, located on the engine. A smaller relay powers the auxiliary motors for the footwell ducts. The unit uses temperature sensors and heater control settings to determine fan operation.
The most common faults are loss of function of the main blower motor and/or the auxiliary motors. Note that if the main blower motor is not operating / drawing operational current the auxiliary motors will not operate. Ensure that all motors are not seized and operate freely.
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