Fan noise after turning engine off..........?

[Vet4jdc]

I have a 2010 SWCC that has been deleted, Spartan tuned and S&B CAI.....for the past few weeks, every time I shut the engine down, I hear something winding down to a slow stop...not sure if it's the fan, the turbo or what? Any ideas what I'm hearing and if it's a problem?

[rentstdi]

The turbo. It takes a while to slow down after going a few thousand rpm

[ZMANN]

agreed sometimes the turbo's spool down and huff a little

[Evil PSD]

Does your truck have plow prep ? Might just be the fan slowing down, mine does it in the winters.

[Vet4jdc]

no plow prep....perhaps it is the turbos. I wonder why I never heard it before?

[Vet4jdc]

seems like the winding down noise is getting worse. Anyone else know whats going on and should I be worried if this is the turbo spooling down? How can I tell if it is jus the turbo?

[JSBucinski]

Mines does it too, it is your turbos spooling down. You probably didnt start to hear it until you did all the MODs to your truck. Open things up a bit and you can hear them more. The noise is much louder when i park in the garage.