Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Its at the intake manifold hidden by the air cleaner housing:
Fig. Thermostat installation-4.6L Engine
Fig. Loosen the upper radiator hose clamp at the thermostat housing
Fig. Remove the upper radiator hose clamp from the thermostat housing
Fig. Remove the thermostat housing retaining bolts and . . .
Fig. . . . remove the thermostat housing from the engine
Fig. Separate the thermostat from the housing