Where is the thermostat located on a 2000 Cadillac Seville sls?

Looking from the front down on the right hand side you have to remove the air filter box to access it. There is a hose that goes into a metal housing that splits the water flow in 2 directions. Remove the 2 bolts that hold the thermostat in the housing and pull back on the hose. Make sure to match your old one with the new one before you install it.