2001 Cadillac Deville coolant drain and thermostat location

Drain is on the drivers side front of the radiator tank, you can see it through the front grille area of the bumper fascia. 19mm socket fits on it, there is a hole in the lower splash shield for access, I just remove the shield to minimize the mess. Follow the lower hose to the water pump cover, that black housing that is bolted on is the T-stat housing.