Ok......2006 LaCrosse/ 3.8L/80,000miles.
Series of events:
Overheated 2 months ago, 4 different times and boiled out the coolant.
I replaced the thermostat and it still overheated within a week.
I then removed the thermostat and filled with water hose.
Let it run for 2 months without thermostat with water while monitoring water level in overflow tank.
Today car overheated for the first time and boiled out water.
I'm stumped....Any suggestions?
Thanks