Parts for your 2003 Mitsubishi Pajero-Radiator

2003 Mitsubishi Pajero Radiator: What it does, why it matters, and how to look after it

Technical sources confirm the 2003 Mitsubishi Pajero is fitted with a conventional liquid-cooling system that uses a front-mounted radiator. The Mitsubishi Motors NM/NP Pajero Workshop Manual (Cooling System section, model years 2000–2006) specifies an aluminium crossflow radiator with plastic end tanks, and the Mitsubishi ASA/CAPS parts catalogue lists the radiator assembly for both petrol and diesel variants, with an integrated automatic transmission oil cooler on auto models. Haynes- and Gregory’s-style service guides for the Pajero of this era echo the same setup.

On this Pajero, the radiator’s job is to pull heat out of the engine coolant so the 3.2 Di‑D diesel or V6 petrol runs at a steady operating temperature. That keeps power consistent, protects head gaskets and alloy components, and makes sure the cabin heater works properly. Most variants use an engine-driven viscous fan (with an electric condenser fan up front), so airflow at idle and low speeds is strong enough for towing, beach work, and slow off‑road climbs.

When it comes to servicing, coolant quality and flow are everything. Use the correct long‑life ethylene‑glycol coolant that meets Mitsubishi specs, mixed 50/50 with demineralised water unless the product says otherwise. Many owners in Australia and New Zealand stick to 2–4 years or 40–60,000 km for coolant changes, or follow the latest genuine long‑life coolant interval if using the OEM fluid. Always bleed air properly with the heater on hot and the vehicle level, and pressure‑test the system and cap to the rating in the manual.

Signs the radiator needs attention include overheating at idle or on climbs, crusty green/white deposits around the tank crimps, damp spots or a sweet coolant smell, brittle hoses, or discoloured “muddy” coolant. On automatic models, the radiator contains a transmission cooler—so any pink/brown “milkshake” or rising ATF level is a stop‑drive situation. If replacing the radiator, it’s smart to do the cap, thermostat, upper/lower hoses, and clamps at the same time. For autos, inspect and reconnect the cooler lines carefully and check for leaks after a short drive.

Off‑roaders should rinse the fins gently with low pressure after mud or beach runs—high pressure can fold fins and reduce cooling. For heavy towing or desert work, a heavy‑duty core, fresh fan clutch, and a clean condenser in front of the radiator make a noticeable difference. Stick to OEM‑equivalent radiators with correct mounting points and shroud fitment to keep airflow right through the core.

• Flush and refill on schedule, use the right coolant.
• Check for leaks, brittle hoses, weak cap, and a lazy fan clutch.
• Keep fins clean, avoid high‑pressure blasting straight at the core.

Popular questions about a 2003 Mitsubishi Pajero radiator

Does the 2003 Pajero radiator include a transmission cooler?
Yes on automatic models—the radiator has an internal transmission oil cooler. Manual models don’t use that feature. If the radiator ever fails internally on an auto, coolant and ATF can cross-contaminate, so any sign of milky fluid demands immediate investigation and likely radiator replacement plus a full ATF service.

What coolant type and how much does it take?
Use an ethylene‑glycol long‑life coolant meeting Mitsubishi specifications, mixed with demineralised water (typically 50/50 unless the product states premix). Capacity is roughly 8–10 litres depending on engine and spec. Always confirm exact capacity and spec in the vehicle’s service manual.

How often should the coolant be changed?
Common practice is every 2–4 years or 40–60,000 km, or as per the latest interval for genuine Mitsubishi long‑life coolant if that’s what’s used. Shorter intervals are wise for vehicles that tow, see lots of off‑road work, or live in hot climates.