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Why does the rear air in your 02 Trailblazer run when the vehicle is turned off?


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the air wont run if engine is shut off. u need engine running to operate the compressor. i would check the rear air blower. sounds like the blower switch is not working or there is a short in blower motor get it checked before it causes a fire in vehicle . try removing rear blower fuse and see it that stops it it is a good place to start looking for the problem