Question about 2000 Chevrolet Blazer

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Heater Control 2000 Blazer. Heater fan works on lower settings only. 1st, I replaced the switch. Then the resistors. Problem remains.

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Try the blower relay it mounted near the resistors on the fire wall

Posted on Feb 08, 2009


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Hello Jstorm.

When this problem occurs the blower motor resistor has gone open circuit.
The reason it works on high is because on high setting it uses full battery voltage and bypasses the resistor.
The resistor or module(depends on whether you have manual or auto temp control) is mounted below the blower motor on the heater case.
You may need to remove the hush panel just above where the passengers feet would be to get to it.
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Happy New Year.


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