Where is the coolant tank in your 2003 Ford Expedition?

The coolant reservoir (often mistakenly called the coolant tank) on a 2003 Ford Expedition is located on the passenger side of the engine compartment, usually towards the front. It's a translucent plastic tank, so you should be able to see the coolant level fairly easily. It's often near other components like the power steering reservoir and brake master cylinder, but its translucent nature helps it stand out.