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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 22756
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Switch speed(heater) speed 1 2 and3 not working speed

Customer Question

Switch for fan speed(heater) speed 1 2 and3 not working speed 4 works is it the switch
Submitted: 2 years ago.
Category: Car
Expert:  Matt replied 2 years ago.
hello you don't say what car this isbut what is common to a lot of models is the heater fan speed is controlled by a large resistor, that sits inside the air duct and so drops the current to the motor to achieve a lower speed so take a look under the dash to locate the heater fan motor ( it'll be a big cylinder) and there will be a resistor wired to it close by - replace this and that should restore the fan function
Expert:  Matt replied 2 years ago.
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