Engine Coolant Expansion Tank for Mitsubishi SUVs and Pickups
This OEM-grade coolant reservoir is a direct-fit piece for popular Mitsubishi body-on-frame models. It stabilizes the cooling system by storing excess coolant when the engine is hot and returning it when temperatures drop. Built from heat‑resistant polymer with molded ports for quick hose hookup, it keeps your radiator healthy and your engine at the right temperature.
Why this part is needed ✅
In a sealed cooling system, coolant expands under heat. The reservoir provides a safe buffer, maintains correct pressure, and prevents air from entering the radiator. It also lets you check coolant level at a glance—no cap removal, no burns.
How it works
As temperature rises, coolant flows from the radiator neck through the overflow hose into the tank. When the engine cools, vacuum draws fluid back, keeping the core filled. Integrated level marks guide top-ups; a tight cap and sound seams preserve system pressure.
If the tank is damaged ⚠️
Cracks, loose fittings, or a warped neck cause leaks and air ingestion. Expect overheating, weak cabin heat, coolant smell, stains, and frequent top-ups. Running hot risks head gasket failure, warped heads, and costly radiator damage.
Tech tips
Inspect hoses and clamps, replace brittle grommets, bleed air after refill, and use the correct coolant type. Swap at first sign of clouding or seam sweating.
Compatibility
- Pajero Sport
- Montero Sport
- L200
- Triton
- Strada
