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Simply put... It's because the failure mode of the blower control module is electric power on! (even with ignition off)... Disconnect the battery, or better... find and remove the 30 amp blower fuse. Remove and replace module with serviceable unit. Reinstall fuse or reconnect battery. Good luck! Note: If the blower is noisy at high speed or in cold temperatures, (if it vibrates or rumbles and squeals), now is the time to change it!

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Q: 2004 Chevy Impala blower motor will not stop running even when car is turned off?
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