Parts for your 2000 Mitsubishi Pajero-Radiator

2000 Mitsubishi Pajero Radiator — Purpose, care, and when to replace

Based on technical references including the Mitsubishi Pajero NM/NP Factory Service Manual (Cooling System, 2000–2006), the Haynes Mitsubishi Pajero/Montero Repair Manual, and Mitsubishi parts catalogues for NM series, the 2000 Mitsubishi Pajero is fitted with a radiator as a core part of its liquid-cooling system. Both the 3.5L 6G74 petrol and the 3.2L 4M41 Di‑D diesel engines rely on the radiator. So yes, a radiator is absolutely relevant and used on the 2000 Pajero.

On this model, the radiator’s job is to pull heat out of the engine coolant and keep operating temps steady, typically in the mid‑80s to mid‑90s °C range under normal driving. It works with the thermostat, water pump, viscous fan and shroud, and often an electric fan. Many automatic Pajeros also route transmission fluid through an internal cooler built into the radiator tank, helping protect the auto from heat when towing or off‑road.

For day-to-day servicing, a healthy radiator means a happier engine on Aussie and Kiwi roads. It’s worth checking for stains or dampness around the end tanks and seams, crusty coolant traces, swollen hoses, a tired radiator cap, and bent or blocked fins that reduce airflow. If the Pajero does lots of beach runs or bulldust tracks, gently clean the fins from the engine side out to avoid folding them over. Keep the fan shroud in place — it makes a big difference at idle and low speed.

Coolant condition is key. Use the correct long‑life ethylene‑glycol coolant that meets Mitsubishi specifications (often a blue or green long‑life formula in our market) mixed to the proper ratio. Refresh intervals vary by product, but a safe guide is every 2–4 years or 40,000–80,000 km. Always refill slowly, run the heater on hot, and bleed the system (use the bleed screw where fitted) to avoid air pockets that can cause hot spots.

Replacement time? If the plastic end tanks are cracking, the core is corroded, temps creep up under load, or pressure testing won’t hold, it’s time for a new unit. Choose an OE‑quality aluminium core with the correct fittings for the NM series. For autos, inspect the internal trans cooler circuit and consider adding or servicing an auxiliary cooler if towing. Fit new upper and lower hoses, clamps, and a quality cap with the correct pressure rating. After installation, pressure‑test, confirm fans and thermostat operation, and recheck coolant level over the next few drives.

• Tip: Milky transmission fluid or strawberry‑milk coolant can indicate internal cooler failure — act fast to avoid gearbox damage.
• Good practice: Replace the thermostat and cap when doing a major radiator job.

Popular FAQs

How can someone tell if their 2000 Pajero radiator is failing?

Watch for creeping temperatures on hills, coolant smell after parking, visible leaks around the end tanks, or coolant loss with no obvious drip. Discoloured coolant, oil‑like sheen in the overflow, or repeated need to top up are red flags. A pressure test and an infrared scan across the core can confirm cold spots or leaks.

What coolant and how much does the Pajero typically take?

Use a Mitsubishi‑approved long‑life ethylene‑glycol coolant (silicate‑free/HOAT‑type commonly used here) at the recommended mix. Capacity varies slightly by engine and whether the heater is fully bled, but it’s generally in the ballpark of several litres, always consult the owner’s or workshop manual and fill to spec, then bleed with the heater on hot.

Does towing or off‑roading change radiator maintenance needs?

Yes. Heavy towing, sand work, and low‑speed climbs load the cooling system. Clean the fins more often, verify the viscous fan clutch engages properly, and check for mud or seeds trapped in the core. If temps climb when towing, consider a fresh radiator, an auxiliary trans cooler for autos, and ensure the shroud and undertrays are intact for proper airflow.