If you check your coolant regularly; maintain the proper coolant level and make sure that the radiator cap is the proper type and is functioning properly, you shouldn't have any problems. Many GM dealers are now advising customers to have a flush & fill done on DexCool systems at the 5 yr/50,000 mile mark.
The problem with those engines begins with impurities in the coolant that cause corrosion on the intake gaskets which in turn causes them to leak. Watch for "gunk" to form on the inside of the radiator cap and in the coolant recovery tank and if you see this, take it to a dealer ASAP to have the system flushed and clean DexCool re-installed.
Some people will tell you to flush the system and replace it with regular anti-freeze - DON'T. If you do this, you must be absolutely certain that you remove every trace of DexCool from the system or you will only create a problem where none may have existed before.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% There are two classes of pedestrians in these days of reckless motor traffic - the quick and the dead. ~ Lord Dewar 1933 ~
Climbing into a hot car is like buckling on a pistol. It is the great equalizer. ~ Henry G. Felsen 1964 ~