Buy OEM 2003 Buick Part # 12590758. Engine Coolant Thermostat Housing. 4.4 LITER. XLR; 4.4L. Engine Coolant Thermostat Housing - Repair or Replace A failed thermostat

Thermostat. Housing.
Engine Coolant Housing where a Thermostat is used but not included. Assembly - Engine Cooling. hsng. Engine Coolant. Water Neck.

Engine Coolant Thermostat Housing

Fits XLR

4.4 LITER. XLR; 4.4L.
Engine Coolant Thermostat Housing - Repair or Replace
A failed thermostat housing will likely result in a cooling system leak, or will cause the engine in your 2003 Buick to overheat. Consider replacing your engine coolant thermostat or having our staff of expert techs handle it for you.