Toyota Avalon Coolant reservoir

Description

The coolant reservoir, or overflow tank, is a critical component of your Toyota Avalon’s cooling system. It holds the excess coolant that expands and contracts as your engine heats up and cools down. If you’re noticing a low coolant level or a puddle of fluid under your vehicle, a crack in the reservoir is a common cause. Over time, the plastic can become brittle from constant heat, leading to hairline cracks and leaks.