What is your question?
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What is your question?
If I turn on the heat or air conditioning fan/blower only works on the highest (5) setting; if 1,2,3,4 is selected nothing happens. What is the cause for this?

1 Reply
This is a very common symptom of a heater blower motor resistor failure. All the power is routed through the resistor on the lower speeds, and it bypasses the resistor on the highest setting.