2004 Chevrolet Silverado 2500HD
Problem for Chevrolet 2004 Silverado 2500HD

Heater fan runs on hi all the time. even when the




By clack901 on Oct 27, 2009

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heater fan runs on hi all the time. even when the key is turned off.

Solution #1

posted on Oct 27, 2009
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Rank: Guru  Chevrolet Cars  Expert
Rating: 92%, 154 votes
I gave this answer to a Trailblazer owner but it fits yours too.

There is a resistor for the blower that has a relay built into it that sticks in the run position on high. The resistor is usually bad and sometimes the connector is also burned. The resistor is on the passenger side under the dash near the blower.

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