Buy 2003 Mazda B4000 Base Extended Cab Pickup Fleetside Cap. Reservoir. Washer. 2.5 LITER. Engine Engine, Coolant, Cooling - OEM Mazda Part # ZZM176678 (ZZM1-76-678)

A cover that prevents foreign debris from entering the container. Washer Fluid Reservoir Cap. Fluid. W/SHIE. Engine Coolant. Included with: Reservoir assembly.

Washer Fluid Reservoir CapEngine Coolant Reservoir Cap

Fits B2300, B2500, B3000, B4000

2.5 LITER.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your 2003 Mazda B4000 to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.