# 2004 Chevy Impala Heater Fan

**URL:** <https://community.cartalk.com/t/2004-chevy-impala-heater-fan/40735>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, impala\
**Created:** [December 13, 2009, 10:18pm UTC](https://community.cartalk.com/t/2004-chevy-impala-heater-fan/40735 "2009-12-13T22:18:38Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![modestjenni](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@modestjenni](https://community.cartalk.com/u/modestjenni)\
**Post date:** [December 13, 2009, 10:18pm UTC](https://community.cartalk.com/t/2004-chevy-impala-heater-fan/40735/1 "2009-12-13T22:18:38Z")

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Just today I got in my car and went to turn on the heater and it’s not working! I tried adjusting the fan speed and it made no difference. With the fan speed all the way on high I then tried adjusting position (floor, dash, or defrost). When I would change from one to the next, it sounds like a motor comes on for about 3-5 seconds and blows a little bit of air and then shuts off completely. each time that I would switch from one to another it would turn on and then off again. What could be the problem?

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [December 13, 2009, 10:28pm UTC](https://community.cartalk.com/t/2004-chevy-impala-heater-fan/40735/2 "2009-12-13T22:28:04Z")

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You have two choices. Either the HVAC control module is defective, or the blower motor control processor is defective.

Tester

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**Author:** ![euryale1](https://avatars.discourse-cdn.com/v4/letter/e/41988e/32.png) [@euryale1](https://community.cartalk.com/u/euryale1)\
**Post date:** [December 13, 2009, 10:30pm UTC](https://community.cartalk.com/t/2004-chevy-impala-heater-fan/40735/3 "2009-12-13T22:30:04Z")

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Sounds like a heater door is stuck. Does the fan turn off or just the motor noise?

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**Author:** ![modestjenni](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@modestjenni](https://community.cartalk.com/u/modestjenni)\
**Post date:** [December 13, 2009, 10:46pm UTC](https://community.cartalk.com/t/2004-chevy-impala-heater-fan/40735/4 "2009-12-13T22:46:19Z")

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The fan comes on and blows very lightly and you can hear the motor trying to kick in but it shuts off after about 3 seconds.