Cayenne. Engine Coolant Thermostat Gasket. Engine Coolant Thermostat Housing O-Ring. Engine Coolant Thermostat Housing Seal. Engine Coolant Thermostat O-Ring. Part has related component that cannot be reused/reinstalled; O-Ring. Part cannot be reused/reinstalled. Thermostat Assy. Housing O -. hsng. unit o -. Gasket. Included with: Housing, Housing Part cannot be reused/reinstalled, Thermostat unit, Thermostat unit Part cannot be reused/reinstalled.