03-17-2011, 02:54 AM
Check and make sure the temp gauge is giving you an accurate reading. On most newer cars the computer will shut it down when it gets too hot rather than allow engine damage. It sort of happens gradually, kind of like you're describing. Chevys have a fairly narrow range of temp they are designed to operate in and they'll sometimes shut down even before the temp gauge has reached an alarming position. See if the electric cooling fan is turning on when its supposed to. You can try turning on the AC and if the fan doesn't kick on that could be it.