2015 Chevy Tahoe Fan Won't Turn Off - Help Needed!

Chevrolet Models Chevrolet Tahoe
1

I’ve been experiencing a frustrating issue with my 2015 Chevy Tahoe where the radiator fan just won’t turn off, even after I’ve shut off the engine. It’s been running continuously, and I’m worried about the potential damage it could cause or if it’s a sign of a bigger problem.

Symptoms I’ve Noticed:

  • The fan runs for an extended period after I’ve turned off the vehicle.
  • Sometimes, I can hear it revving up even while I’m driving.
  • Noticed a bit of a drop in fuel efficiency lately, but I’m not sure if it’s related.

What I’ve Tried So Far:

  • Checked the coolant levels to make sure they’re in the proper range.
  • Turned the AC off and on to see if that makes a difference; it doesn’t seem to help.
  • I’ve scoured a few forums, and it seems like others have had similar issues with their Tahoes. Some mentioned it might be related to a faulty coolant temperature sensor or even an issue with the thermostat.
  • I disconnected the battery for a few minutes to reset the system, but the fan came back on after starting the car again.

Questions:

  • Has anyone dealt with this issue before?
  • Could it just be a faulty sensor, or should I be looking into the thermostat as well?
  • Any recommended fixes or DIY ideas before I take it to a mechanic?

I appreciate any insights you all can provide! Trying to gather as much information as I can before making a trip to the shop.

2

I had a similar issue with my Tahoe. Start by checking the fuses and the relays. The fan relay can sometimes get stuck, causing the fan to run continuously.

3

Thanks for the tip! How do I locate the fan relay? Is it under the hood?

3 Likes
4

Yes, the fan relay is typically located in the fuse box under the hood. You can check your owner’s manual for the exact location.

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5

Also, don’t forget to inspect the wiring connecting to the fan motor. Any frayed wires could cause it to short and run constantly.

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6

Good point! Has anyone here dealt with faulty wiring in this model? How did you fix it?

7

I once had to replace a damaged wire. It involved a bit of patience but isn’t too hard if you follow the diagrams in the repair manual.

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8

Just make sure to disconnect the battery before doing any electrical work! You don’t want to accidentally short something.

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9

Are there any specific fuses I should focus on? I wouldn’t want to check them all!

10

Check the fuse labeled for ‘Cooling Fan’. It’s usually a 40A fuse, and it’s often easy to access. If it’s blown, replace it and see if that solves the problem.

11

If replacing the fuse doesn’t help, you might want to use a multimeter to check if power is reaching the fan motor. That could rule out power issues.

12

Using a multimeter is simple! Set it to measure voltage, touch the probes to the fan motor terminals, and see if you get a reading when the fan should be on.

13

Don’t forget that sometimes the issue can be a faulty fan switch too. If the switch is stuck in the ‘on’ position, it might leave the fan running.

14

Interesting! Is there a way to test the fan switch without pulling it out?

15

Yes! You can check if the switch is functioning by testing continuity with a multimeter. If it’s stuck, you’ll need to replace it.

16

This sounds like a lot of work, but I suppose it’s better than having a fan that won’t turn off. I think I’d rather DIY than pay for a mechanic!

17

Hi! It sounds like you’re experiencing a common issue. One typical reason for the fan running continuously is a malfunctioning temperature sensor. It could be reading incorrect temperatures and causing the fan to stay on. Have you checked that?

18

I’ve had the same issue! Another reason could be a problem with the climate control system itself. Sometimes resetting the system can help. Have you tried that?

19

Isn’t it weird how electrical gremlins can act up? But seriously, a software update might help. Sometimes those updates fix bugs that lead to these kinds of problems. Have you checked if there are any available updates?

20

I completely agree! I had a similar issue with my Tahoe, and it ended up being a faulty relay in the fan control module. Maybe check that too!