Fan running excessively

[ItstheHOFF]

Today my wife complained that the Suburban is a lot louder than usual. When she got home it was still loud, it seems the coolant fan is on some sort of overdrive and won’t quit. The oil temp was very low. Even when she turned it off, the fan still ran. What could have caused this? Has this happened to anyone else? It’s the 5.3 btw

 

[Tahoe14]

Maybe the coolant fan sensor is bad.

 

[mrathell]

I agree with Tahoe14, replace the coolant temp sensor. It's a 5 minute job, 10 minutes for a first timer.

https://www.amazon.com/gp/product/B001W0FSMM/ref=ox_sc_act_title_1?smid=A3CVB1NQ4KWZRK&psc=1

 

[malones99]

Worked for me... Remember to disconnect the battery or clear the code. Should be good after you replace the sensor. Took maybe 5 minutes to replace with minimal coolant loss.

 

[cjlaw73]

This just happened to me today. I'll try this idea. Thanks!!!

 

[84wildcard]

I've been working on this problem on my wife's 2016 Tahoe. I replaced the sensor and the problem came back some time after. I've been resetting the computer by pulling the positive battery terminal and holding the key to start for 15 to 20 seconds to fix this problem. This is clearly a bandaid as the problem comes back after a week. If anyone has a schematic of the cooling system on this vehicle it would help alot.