Why does my engine fan turn on more after a tune?

My engine fan sounds like a jet engine, so it's hard not to notice. Every time I switch tunes, the fan comes on for 2 seconds every minute of two. Then after a while (1 hour maybe?) it seems to calm down.

Why is that?

I suspect your ECU is learning the new tune and making adjustments. After the adjustments are in place (I'm told by one of the AIRAID engineers that these ECUs learn very quickly), then the fan behavior settles down accordingly.

My 2 cents. Other people know more than I do and may have a more informed response.

Did it happen with the SVC tune?

I have the 91 Perf tune on my 2014 from 5 star. I live in AZ and bought the truck in Feb. Fan seemed "normal". But as it turned hotter, the fan now comes on almost immediately and full bore. Contacted 5 star and they say that this is normal behavior for the 91 Perf tune. I took out the tune and fan on full speed happens much, much less.

Thought it was just me. Running a 93 tune and it's the loudest fan I've heard. I bought mine in late October so I haven't really used the A.C in hot weather until 2 weeks ago.

That's nothing! Check out my fans:

http://youtu.be/3cAhJdk23aw

Not my truck, but same fans.

TurboEd said:

Did it happen with the SVC tune?

Click to expand...

Yup. And the 5 Star and SCT tunes as well.

---------- Post added at 07:17 AM ---------- Previous post was at 07:16 AM ----------

mike.s said:

That's nothing! Check out my fans:

http://youtu.be/3cAhJdk23aw

Not my truck, but same fans.

Click to expand...

I love it. Those look like Raptor fans.

Cooler engine produces more power, you might want to change the thermostat to something cooler rather than the stock 195 degree.
Try a 180 for the summer months.

Cool (pun intended). How do I do that?

Any auto parts store will do, try to get a good high flow one.