Where is the themostat on a 1993 Pontiac Bonneville 3800 motor?
The 1993 Pontiac Bonneville with a 3800 engine doesn't have a thermostat in the traditional sense that you might be able to easily see and replace yourself. The thermostat is integrated into the engine's housing. It's not a separate, easily accessible unit like on some cars. You'll need to consult a repair manual specific to your vehicle year and engine to find the exact location within the engine's cooling system. It will likely be at the water outlet or near the cylinder head. Accessing and replacing it is a more involved job than on cars with externally mounted thermostats.