You should not be worried about the fan running, it is supposed to if the engine is shut off running warmer than usual. I believe the temp is 220 where the fan runs full speed, and if you shut it off with the temp near 214 and up, it will run to cool the car down. Try to stay out of the Turbo the last few miles before shut down will help also.
Be sure the coolant is fresh, most likely has been changed, but if you don't know, it would be wise to flush and put new antifreeze in. If the color of the anti freeze is pink, I would suggest you just put new Delco fluid in. Mixing anti freeze can cause real problems. Most seem to change it to the green stuff. My mechanic will not use the Delco stuff for any reason, but GM has for years.
If your car is a Redline/GXP you are at the magical mileage for the water pump to fail. Check under the car on the passenger side, right at the back of the front tire. If you have water dripping from there, you are on your way to an exciting new water pump. Some never fail, but watch that area for as long as you have the car. They can cause real problems if they go. Not a cheap fix either way.
Most likely though, it is just the cooling system trying to cool the car down.
Last edited by skersfan; 04-25-2019 at 12:02 PM.