Where is the sensor that controls the water temp in a 1994 buick park avenue ultra?

I have been trying to find where it is located in the car. The one I believe it is on the back of the manifold near the engine block but I cant find the right one in the auto store to replace it. Is this really the sensor that needs to be replaced or notWhere is the sensor that controls the water temp in a 1994 buick park avenue ultra?jhkhWhere is the sensor that controls the water temp in a 1994 buick park avenue ultra?You have a temperature sending unit either on the cylinder head or at the thermostat housing.If you are having temperature control problems, you more than likely have a thermostat problem.Sticking is what is what you call it, may need replacing...