Buy 2021 Mazda 3 Select Sedan Engine Coolant Reservoir Cap. CX-30; Expansion Tank Cap. JAPAN BUILT Tank, Cooling, BUILT - OEM Mazda Part # PX4J15355 (PX4J-15-355, )

Cap. SUB. Reservoir.
A cover that prevents foreign debris from entering the container. Engine Cooling. Tank. Engine Coolant. Included with: Reservoir, Reservoir Tank.

Fits 3, CX-30

CX-30; Expansion Tank Cap. JAPAN BUILT. MEXICO BUILT. W/2.5 LITER TURBO.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your 2021 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.