I have a 1994 Bonneville SE...Can someone tell this ol fellow where the thermostat is located so my son can help me put one in. Many thanks

its located under the metal thermostat housing on the top to the motor where the upper rad hose is clamped to

Like Peter says, if you follow the top radiator hose to the engine, the part it connects to is the water outlet. That water outlet piece has two 10mm bolts that hold it to the engine and the thermostat is directly below it.

You year should have a rubber gasket around the thermostat and a paper gasket for the outlet housing.

Thank you for your time...

If you drain the coolant below the thermostat, make sure you fill the engine at the thermostat opening first. These engines are prone to trapping air. That can cause problems. If you follow this coolant fill procedure in techinfo, you will be OK.
http://www.bonnevilleclub.com/forum/...=article&k=100