Parts for your 1988 Mitsubishi Pajero-Coolant

1988 Mitsubishi Pajero coolant — what it does and how to look after it

Coolant is absolutely relevant and used on the 1988 Mitsubishi Pajero. The model’s engines (including 4G54 2.6 petrol, 6G72 3.0 V6, and 4D56 2.5 turbo‑diesel) are all liquid‑cooled with a radiator, thermostat and water pump. This is clearly stated in the Mitsubishi Pajero/Montero Factory Service Manual (1988, Cooling System chapter), the period Owner’s Handbook, and popular workshop guides such as Haynes (Pajero/Montero 1983–1996) and Gregory’s 501. Those sources specify an ethylene‑glycol antifreeze/anti‑boil coolant in a water mix.

On a 1988 Pajero, coolant does a lot more than just stop overheating. It carries heat away from the cylinders to the radiator, raises the boiling point and lowers the freezing point, and packs corrosion inhibitors that protect the alloy head, radiator, heater core and pump from internal rust and scale. It also lubricates the water pump seal, which helps prevent leaks.

For Australia and New Zealand, use a Type A ethylene‑glycol coolant (per AS 2108) at 33–50% with demineralised water. Older Mitsubishis are typically happiest on an “Asian‑formula” silicate‑free coolant (often green or blue) with phosphate‑based inhibitors that play nicely with alloy components. System capacity varies by engine, but expect roughly 8–10 litres, always check the service manual for your exact engine code.

Service intervals for factory‑type coolant are typically every 2 years or about 40,000 km. If changing to a modern long‑life formula, flush thoroughly and follow the coolant maker’s longer interval only if the system is spotless and compatible. After refilling, bleed air from the system (top hose warm, heater on hot, squeeze hoses to purge bubbles) and verify the radiator cap holds pressure. Watch for tell‑tales like rusty or milky coolant, rising temps under load, a sweet smell, or coolant loss—these are your cues to service sooner.

• Check the level monthly when the engine is cold and top with the same mix.
• Inspect hoses, clamps, radiator cap and water pump weep hole for leaks.
• Flush if coolant looks brown, cloudy, or has debris.
• Dispose of old coolant responsibly, it’s toxic to pets and wildlife.

FAQ: What coolant type suits a 1988 Pajero?

A quality Type A ethylene‑glycol coolant mixed 50/50 with demineralised water is a safe bet. Many owners prefer an Asian‑spec, silicate‑free coolant (green/blue) due to good compatibility with alloy components used in this era of Mitsubishi engines.

FAQ: How often should the coolant be changed?

Plan on every 2 years or 40,000 km for conventional coolant. If converting to a reputable long‑life coolant, only stretch intervals after a proper flush and compatibility check, and keep an eye on colour and clarity during routine servicing.

FAQ: How much coolant does it take, and how do you bleed it?

Most 1988 Pajero engines take about 8–10 litres total. Fill slowly, run the engine with the heater on hot, and burp the upper hose to release trapped air. Recheck the level after the first drive and top up the overflow bottle to the “Full” mark.