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Blower motors are part of the air conditioning system in Chevy Trailblazer, and they blow hot or cold air from the AC vents to the cabin. If a blower is faulty, air will not circulate out of the vents if it has stopped blowing air because of a bad blower. Here are the common causes of Chevy Trailblazer not working properly and how to fix it.
Blown Fuse
The air conditioner blower in a Chevy Trailblaizer requires electricity to run. If the fuse is blown, the circuit will be cut and the motor will not work.
How to Fix
It is possible to locate the fuse that blows the power to the blower motor from the owner’s manual or from the fuse box cover. If a fuse blows, use a new fuse that has a different amp rating.
To check the fuse, first remove the fuses from the box by pulling the fuses out with a fuse puller or by holding the fuses in your hand by pulling on them with needle nose pliers. If it is damaged in the middle, the fuse has exploded. You will need to use a fuse of the same size and also of the same amperage and also the same color. It doesn’t really make any difference which way you place the fuse.
Bad Relay
Relays allow you to control an electric circuit by turning on and off a certain number of components. Bad relays in Chevy Trailblazers are sometimes responsible for causing the blower motor to fail.
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How to Fix
First, check where the blower motor relay is on your specific Trailblazer. This will be described in the owner’s manual of the model of vehicle you are using. Relays may be found in the engine compartment, or you can find them under the steering wheel which is on the left-side of your car. If you are lucky, you will find the wiring diagram for the relay on the vehicle’s dashboard. You should test it by switching it to a relay that has the same amp rating as the one that is in the fuse box. It is important that you remove the battery from your vehicle before installing the new one.
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Ask a Mechanic Live NowBad Resistor/Control Module
The purpose of a resistor is to cause the speed of a blowing motor to be controlled. When the fan in the Trailblazer is running at a higher speed, the climate control unit sends a signal to the resistor module to force the motor to produce more or less power. If a fault occurs in the resisting module, the motor will stop functioning.
How to Fix
Local mechanics or repair shops will be able to help you. However, if you want to speak with your dealer about replacing a part or repairing a faulty electrical system, it is usually easiest to call and schedule an appointment with your local mechanic or the parts department. Most garages or parts suppliers stock all the parts needed for a blower motor or control module replacement. The blow-off resistor or control module replacement is not extremely costly.
Max Anthony
Max is a gizmo-savvy guy, who has a tendency to get pulled into the nitty gritty details of technology and cars. He attended UT Austin, where he studied Information Science. He’s married and has three kids, one dog and a GMC truck and a Porsche 911. With a large family, he still finds time to share tips and tricks on cars, trucks and more.
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