# Fan noise **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, trailblazer\ **Created:** [November 23, 2010, 1:24am UTC](https://community.cartalk.com/t/fan-noise/57884 "2010-11-23T01:24:10Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![48ford](https://avatars.discourse-cdn.com/v4/letter/4/91b2a8/32.png) [@48ford](https://community.cartalk.com/u/48ford)\ **Post date:** [November 23, 2010, 1:24am UTC](https://community.cartalk.com/t/fan-noise/57884/1 "2010-11-23T01:24:10Z")
2003 trailblazer automatic, 4x4, with 107k, in morning it sounds like the engine is going fast but its not but transmission was checked out and its OK! someone said it was clutch fan is that true? ---
**Author:** ![Carveaholic](https://avatars.discourse-cdn.com/v4/letter/c/f07891/32.png) [@Carveaholic](https://community.cartalk.com/u/Carveaholic)\ **Post date:** [November 23, 2010, 1:29am UTC](https://community.cartalk.com/t/fan-noise/57884/2 "2010-11-23T01:29:39Z")
Your description is a little vague, but yes a fan clutch can lead to excessive noise. It won’t hurt anything though (to the best of my knowledge). Do you have a tachometer? What does it read in the morning when you hear the engine “going fast”? ---
**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:** [November 23, 2010, 1:32am UTC](https://community.cartalk.com/t/fan-noise/57884/3 "2010-11-23T01:32:02Z")
The problem might be with the fan clutch. When the engine is cold open the hood and try spinning the fan by hand. It should spin at least one revolution. If not, the fan clutch is defective. Tester ---
**Author:** ![ignoramus9](https://avatars.discourse-cdn.com/v4/letter/i/d07c76/32.png) [@ignoramus9](https://community.cartalk.com/u/ignoramus9)\ **Post date:** [November 23, 2010, 6:20pm UTC](https://community.cartalk.com/t/fan-noise/57884/4 "2010-11-23T18:20:02Z")
When the fan clutch locks up, that will contribute to overheating at higher engine speed, at least that is what my old dad once told me. Nothing desperate, but it is not an expensive part, and should be replaced if defective.