ME405290 Mitsubishi TANK ASSY,RADIATOR C, Price: 62.19$, Weight: 1.217kg

Radiator Coolant Expansion Tank Assembly for Mitsubishi

This cooling system reservoir is a key support part that keeps engine temperature stable . It stores extra coolant when the liquid expands from heat, then feeds it back as the engine cools down. That simple “in and out” action helps prevent air pockets and keeps the radiator working at full efficiency.

Why this part is needed

Modern Mitsubishi engines run hot under load. The overflow reservoir gives the coolant a safe place to expand, maintains the correct level, and helps the system stay sealed so pressure can raise the boiling point. A healthy tank also makes level checks fast and clean.

How it works

As coolant heats up, pressure pushes excess fluid through the cap/return line into the tank. When the engine cools, vacuum draws coolant back to the radiator. The molded ports and internal shape guide flow and reduce foaming .

What happens if it’s broken

Cracks, warped fittings, or a leaking seam can cause coolant loss, overheating, and repeated “low coolant” warnings. Air can enter the system, leading to poor heater performance, corrosion, and possible head gasket damage . Replace at the first sign of leaks or brittle plastic.