Buy 2006 Toyota SIENNA WAGON, 5-DOOR, LE Engine Coolant Reservoir Cap. 2004-06, US built. 2007-09, US Overflow, Foreign - OEM Toyota Part # 164710A030 (16471-0A030)

Cap. Reservoir.
A cover that prevents foreign debris from entering the container. Exc.Japan Built. Radiator RESERV. Tank. Engine Coolant. Overflow hose. Included with: Shroud.

Fits SIENNA

2004-06, US built. 2007-09, US built. 3.3 LITER. 3.5 LITER. RX350; Canada Built.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your 2006 TOYOTA SIENNA to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.