Quote Originally Posted by bobc455 View Post
I'm afraid that if your coolant level is so low that you're losing it... maybe through an intake gasket (although I think your year came with metal gaskets from GM).

You probably lost a significant amount of coolant for it to heat up so badly, if that's the problem. If your radiator and overflow is full, then you have a flow problem of some kind, and a flush might be a possible solution.
1. My 06 didn't come with the metal LIM gaskets.

2. Clog or stuck thermostat

Sent from my LG G3