# Heater motor only runs on high speed

**URL:** <https://community.cartalk.com/t/heater-motor-only-runs-on-high-speed/60178>\
**Category:** Maintenance/Repairs\
**Tags:** heating, engines, gmc, 1500\
**Created:** [January 19, 2011, 10:41pm UTC](https://community.cartalk.com/t/heater-motor-only-runs-on-high-speed/60178 "2011-01-19T22:41:41Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![jotheuser](https://avatars.discourse-cdn.com/v4/letter/j/dfb087/32.png) [@jotheuser](https://community.cartalk.com/u/jotheuser)\
**Post date:** [January 19, 2011, 10:41pm UTC](https://community.cartalk.com/t/heater-motor-only-runs-on-high-speed/60178/1 "2011-01-19T22:41:41Z")

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Do I have to pull out the complete switch assembly, or could it be some thing else?

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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:** [January 19, 2011, 10:45pm UTC](https://community.cartalk.com/t/heater-motor-only-runs-on-high-speed/60178/2 "2011-01-19T22:45:04Z")

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Most likely the problem is with the blower motor resistor pack. This is located under the passenger side dash mounted to the heater box next to the blower.

Tester

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**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\
**Post date:** [January 19, 2011, 10:46pm UTC](https://community.cartalk.com/t/heater-motor-only-runs-on-high-speed/60178/3 "2011-01-19T22:46:10Z")

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It’s almost certainly the blower speed resistor pack. Of course, your blower may be drawing excessive current. In that case, both the blower motor and the resistor pack would need to be replaced.

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**Author:** ![jotheuser](https://avatars.discourse-cdn.com/v4/letter/j/dfb087/32.png) [@jotheuser](https://community.cartalk.com/u/jotheuser)\
**Post date:** [January 19, 2011, 11:10pm UTC](https://community.cartalk.com/t/heater-motor-only-runs-on-high-speed/60178/4 "2011-01-19T23:10:55Z")

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Thank you very much

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**Author:** ![jotheuser](https://avatars.discourse-cdn.com/v4/letter/j/dfb087/32.png) [@jotheuser](https://community.cartalk.com/u/jotheuser)\
**Post date:** [January 19, 2011, 11:11pm UTC](https://community.cartalk.com/t/heater-motor-only-runs-on-high-speed/60178/5 "2011-01-19T23:11:48Z")

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Thank you also very much