2015 Yukon Fan Keeps Running - What Could Be Wrong?

Technical Discussions
1

I’ve been encountering a strange issue with my 2015 GMC Yukon lately. After turning off the vehicle, the cooling fan keeps running for what seems like an eternity. It’s really puzzling and I’m concerned it might lead to some bigger problems if not addressed soon.

I’ve been doing some digging into what might cause this, and I’ve come across a few possibilities:

  • Faulty Thermostat: Could this be causing the fan to continue running even after the engine is off?
  • Relay Issues: I’ve heard that a malfunctioning relay could keep the fan activated.
  • Sensor Problems: Could one of the sensors be sending the wrong signal to keep the fan working?

Has anyone else dealt with this before? What steps did you take to troubleshoot, and how did you resolve it? I’d really appreciate any insights or advice on whether it’s something I can fix myself or if I should take it to a mechanic. I’m hoping to avoid unnecessary costs, but I also don’t want to risk damaging the vehicle further.

Thanks in advance for your help!

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2

I experienced the same issue with my 2015 Yukon. It turned out to be a faulty coolant temperature sensor. Once I replaced it, the fan stopped running after shutdown.

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3

That’s really helpful! I’ve also heard that sometimes the thermostat can stick open, which keeps the fan running longer. Did you check yours?

4

It’s also worth checking for any electrical problems. Loose wires or a short in the system can cause the fan to continue running after the engine is turned off.

5

Exactly! I had a friend whose Yukon had a similar issue, and it was just a wiring problem. He spent a fortune on sensors before finding that out.

6

Good point! Are there specific areas you should inspect for wiring issues?

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Yes! Look around the fan relay and the fuse box. Those are common culprits for electrical issues. Just make sure to turn off the battery first!

8

I appreciate the tips! But why does it seem like this fan problem is so common in Yukons? Seems like a design flaw.

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9

I think it might just be a combination of age and wear. However, some people joke that Yukons just can’t let go of their work mode! You know what I mean? :joy:

10

Haha! That’s spot on! But seriously, if it’s not the sensors or the thermostat, checking the relays might save some headaches.

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11

And if all else fails, maybe it’s time to take it to a mechanic. Sometimes a professional eye can spot things we overlook. Stay hopeful!

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12

I had a similar issue with my 2015 Yukon. One temporary solution I found was to disconnect the battery for a few minutes. It reset the electrical system and stopped the fan from running. Just be cautious as it can erase your settings.

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13

Disconnecting the battery is definitely a quick fix, but it’s more of a band-aid solution. You should look into what is causing the fan to run continuously in the first place.

14

Another workaround could be pulling the fan fuse, but this could lead to other issues like overheating. I’d recommend trying to pinpoint the root cause first.

15

True, while a fuse pull can solve the immediate problem, it’s risky. You won’t want your HVAC system to malfunction later.

16

I’ve also read that sometimes the fan relay can cause continuous running. If it’s stuck, you might consider replacing it instead of relying on temporary fixes.

17

That’s valuable information! It’s good to know the relay might be the problem. It sounds like a fairly easy part to replace.

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I’m just curious: if you disconnect the battery or mess with the fuses, does it affect any warranty you might have left?

19

Good point! Any modifications can indeed void warranty coverage, especially if it leads to further damage. Always check your warranty specifics!

20

Yikes! I mean, disconnecting the battery sounds like a makeshift method—like all of us trying to fix our cars with duct tape! I’d be nervous messing around with fuses.