Buy 2004 Mazda MIATA Engine Coolant Thermostat Housing. Engine Coolant Thermostat Housing - Repair or Cause, Consider, Cooling - OEM Mazda Part # B63015172B (B630-15-172B, B63015172, USEB63015172B)

Thermostat. Cover, THER. Engine Coolant Housing. Water Neck.
Engine Coolant Housing where a Thermostat is used but not included.

Engine Coolant Thermostat Housing

Fits 323

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 2004 Mazda MIATA to overheat. Consider replacing your engine coolant thermostat or having our staff of expert techs handle it for you.