Radiator Fill Hole

A radiator fill hole, without the cap

The radiator fill hole is a hole at the top of the radiator to which coolant is added. It is sealed by the radiator pressure cap.

Table of Contents

• 1 Pressure Cap

Pressure Cap

The radiator fill hole is seal by the pressure cap. It is designed to release excess pressure when the coolant is overfilled and expands.

Radiator pressure cap when on

A radiator pressure cap