Radiator Expansion Tank — Coolant Overflow Reservoir

Keep your engine safe and steady with this OE-grade expansion bottle. It seals the cooling loop, stores extra coolant during heat cycles, and returns it as the engine cools. The pressure cap maintains system pressure to raise the boiling point, helping the radiator work efficiently even in tough off-road or towing use ️.

Why this part is needed

It prevents air pockets, keeps coolant level stable, and protects hoses and pump from collapse or cavitation. A healthy reservoir reduces overheating risk, extends coolant life, and supports consistent cabin heater performance ❄️.

How it works

As temperature rises, coolant expands and flows through the small hose into the tank. When cooling down, vacuum draws fluid back via the same path. The cap’s valve controls both pressure and vacuum, keeping the system balanced .

If the tank or cap fails

Expect low coolant, hot running, steam, sweet smell, or visible leaks. A cracked bottle or weak cap can trigger boiling, warped head, and limp mode. Replace at first signs of discoloration, swelling, or brittle plastic ⚠️.

Build and fit

Direct-fit mounts, molded ports, and a clear body for quick level checks. Designed for rugged 4x4 duty ️.

Compatibility

• Patrol
• Safari