Buy 2004 Mazda 3 Engine Coolant Reservoir. Engine Coolant Expansion Tank - Repair or Replace A failed Tank, Cooling, Cause - OEM Mazda Part # BP4W15350B (BP4W-15-350A, BP4W-15-350B, BP4W15350A, USEBP4W15350B)

Engine Coolant Reservoir. Tank, SUB.
A container that holds Engine Coolant.

Engine Coolant Reservoir

Fits MIATA

Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your 2004 Mazda 3 to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.