Buy OEM Toyota Part # 1647123030 (16471-23030). Engine Coolant Reservoir Cap. EXPANSION TANK CAP; Corolla. EXPANSION TANK CAP; iQ. Engine Coolant Expansion Tank - Repair or Replace A

Cap. Reservoir. Radiator RESERV. Tank. Engine Coolant.
A cover that prevents foreign debris from entering the container. Part included in shroud assembly. Included with: Reservoir Tank, Shroud.

Engine Coolant Reservoir Cap

Fits Corolla, Yaris

EXPANSION TANK CAP; Corolla. EXPANSION TANK CAP; iQ.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your Toyota to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.