luis,
when you say overheating do you mean physically overheating?
or just the overheat Exx code displayed on the dash display?
Yes these trucks have had issues with overheating codes and were related to fans, incorrect sized pullys and also ECM/VCM related electrical issues. Bad sensors.

Let me get into my technical service bulletins and see if i can find some of the common problems we've had here with this truck.

Oh BTW i work for the CAT dealership here in charlotte, nc in the united states. :o)

I'll be back in touch.

Laterz,