Buy OEM Toyota Part # 1640575020 (16405-75020). Engine Coolant Reservoir Cap. 2.7 LITER. 3.4 LITER. Engine Coolant Expansion Tank - Repair or Replace A failed expansion tank can cause

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

Engine Coolant Reservoir Cap

Fits 4Runner

2.7 LITER. 3.4 LITER.
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.