On the 2.4L engine, the CTS is located on the thermostat housing.
On the 3.0L it is near the distributor.
On the 3.3L and 3.8L engines, it is next to the thermostat housing.
Use a cooling system thermometer to check how hot the coolant in the radiator is getting. Also look into the opening to make sure the coolant is flowing when the engine warms up. The coolant temperature should be between 180 and 200 degrees after driving for a little while.
Wednesday, September 21st, 2011 AT 5:21 AM