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Probably the blower motor speed resistor is partially burned out.

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โˆ™ 2010-08-07 02:28:03
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Q: What causes the heater blower motor in a 2003 Trailblazer to not work in speeds 1-3 but works in speeds 4 and 5?
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Heater blower resistor is what controls the low medium high speeds...


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This is not a common failure. The more likely culprit is the blower moter resistor that controls the fan speeds. Very simple to fix yourself and about $35 for the part. To get more info about this or other Trailblazer '02 and up questions join our forum at www.trailvoy.com


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if you lost one or two fan speeds you need to change the blower motor resister. it sells for around $60.00 at a dealer only.


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