my heater fan is stuck on low.is this a bad relay? how doi checkit?
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1997 Lexus ES300 Question: fan motor
Answer #1precision import from Precision Import Service, December 15, 2010, 09:38Technician
If the fan comes on at all, then the realy is good. The fan speed is controlled by a transistorized controller (called a "linear controller") which is controlled by the A/C control assembly. The diagnostics are not really simple and would require a good understanding of these types of systems and good diagnostic/ repair info. Generally this would be a job for a technicain with good diagnostic skills.