So after tracing the coolant leakage to the water pump I decided it was time to replace it. After getting everything apart I found that it was the water pump seal behind the pump that was leaking. It was the factory pump with 148,000 on it so I say it did it's job. Chevy wanted almost 400 dollars just for the pump and t-stat so i picked one up at napa for 165. I really wasn't expecting it to be as big as it was . It's an easy job to do only took a couple hours, spent more time cleaning the engine bay. No more leak!