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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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Related Questions

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Heater blower resistor is what controls the low medium high speeds...

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A bad heater blower motor resistor would effect one or more blower speeds other than high.

How do you replace a heater switch in a Trailblazer?

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

Where is the switch for the blower the located in a Chevy Trailblazer?

If you do not have fan speeds it may be a fuse or the blower motor resistor. For help with the issue visit our enthusiasts forum at

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the heater fan resister,it is or should be on inside or on outside heater box.

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if all speeds do not work id say is a fuse, but if you just dropped one or two speeds. replace the blower motor resister. sells for $60.00 at the dealer.

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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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Resistor on the heater blower motor has failed

You are not getting any power to the blower motor on a 2005 Chevy trailblazer?

If you have no speeds at all, including high speed and you have power at the fuse and the fuse is good, I would suspect the heater blower speed switch and or the electrical plug to the switch is cooked. If you have high speed only and the rest are dead, I would suspect the blower motor speed resistor.

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More than likely the blower motor resistor pack is bad, although it can also be the switch itself.

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The blower motor resistor is defective. They go bad when the blower motor pulls to much amperage.

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Only for the high speed blower function. The lower speeds go thru the blower motor speed resister.

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What causes the heater blower motor in an 2002 Trailblazer to work in speeds 1-4 but not in speed 5?

2002 TB seems to have problems with the blower motor resistor. Its located under the glovebox. Must remove the glovebox door to access it. Parts stores can't keep them in stock! should be about $20 to replace. Also, I believe fuse #35 in the engine compartment fuse block controls the blower on "5" high setting, so check that first. Either the blower motor speed switch or the resistor pack are bad.

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If all speeds do not work, suspect the fuse, the switch, the switch connector or the blower motor. If only high speed works, suspect the blower motor speed resistor. If low speeds work and not high, suspect the blower motor relay.

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The blower motor resistor is bad.

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Sounds like you need to replace your blower motor resistor.

What is wrong if the heater in a 1999 Honda Civic doesn't get warm?

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What could cause the heater blower motor not to work on a 2002 Trailblazer?

If it works but not on all speeds or is almost making the car stall at idle if you turn the a/c on at a light Than its probably the fan motor resistor pack its $25-$30 at autozone and real easy and fast to replace.