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the blower switch located behind blower motor is shot or burned up. it cost me about $30 dollars at auto zone and 5 minutes to replace. you out.
Look at the link I posted, that should help you. (:
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 www.trailvoy.com
Im pretty sure after you remove the steering column cover, the switch clips in.
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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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Change blower fan control switch in the dash
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If your Trailblazer is a 4x4 the switch should be to the left of the radio on the dash.