Have a 2015 Chevy suburban with 113000 miles. The fan sta...

Have a 2015 Chevy suburban with 113000 miles. The fan starts running on high speed and continues to run loud about 5 min after I shut the truck off. I just got an oil change and a tune up but it’s still doing it Mechanic's Ass...

Have a 2015 Chevy suburban with 113000 miles. The fan starts running on high speed and continues to run loud about 5 min after I shut the truck off. I just got an oil change and a tune up but it’s still doing it Mechanic's Assistant: When was your last oil change? Yesterday Mechanic's Assistant: What is the model of your '15 Chevy? LT Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far? Nothing but a tune up and oil change

Automotive Expert
Hi, my name is\*\*\*\*\* to justanswer. I will be assisting you with your question today. I am sorry that you are having difficulties with your vehicle and I will do my best to help you out. Just to verify, Are we talking about the heater fan that blows hot/cold air? **\*\*As far as phone calls, If you didn't request it, it is most likely the Website prompting you, not me. A Live Call is a "Premium Service" and will cost more money. I prefer communicating via this site, but in some cases a phone call may be recommended\*\***

No it sounds like it's in the [engine](/topics-engine-chevy/).. it still runs even if the ac is offNo belts are turning tho
Automotive Expert
Okay, thank you. Your vehicle is equipped with a **fan clutch which** is a thermostatic engine cooling **fan** that can freewheel at low temperatures when cooling is not needed, allowing the engine to warm up faster, relieving unnecessary load on the engine. As temperatures increase, the **clutch** engages so that the **fan** is driven by engine power and moves air to cool the engine. A fan clutch will make a rather loud roaring noise when first started.

to repair do I need a fan assembly?
Automotive Expert
First check it to make sure it is bad. Test it with engine **cold** and off. If you can **spin** the **fan freely** , it is bad. If good there will be considerable resistance.

If it is bad then I need the whole assembly?
Automotive Expert
Once removed, the fan blade separates from the fan clutch assembly and only the clutch is replaced.

I have to wait for the engine to cool so I'm gonna go ahead and ask. If it's not the clutch what would be the problem?
Automotive Expert
There really isn't anything else it could be. The fan is connected to the [water pump](/topics-water-pump/) which is run by the belt. So, the water pump cannot turn freely with the belt installed. The fan clutch operates separately form the water pump.

Ok thanks!
Automotive Expert
You are very welcome. Best of luck with your repair, and thanks for using justanswer.

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