Parts for your 1997 Mitsubishi Pajero-Heater core

1997 Mitsubishi Pajero Heater Core — What It Does and How to Look After It

Technical sources confirm the 1997 Mitsubishi Pajero is fitted with a heater core (often called a “heater radiator”). This is documented in the Mitsubishi Pajero/Montero V2–V4 Factory Service Manual, Group 55 Heating and Air Conditioning, the Mitsubishi ASA/FAST electronic parts catalogue for V26/V46 models, and aftermarket references such as Gregory’s and Haynes manuals covering 1991–1999 Pajero. So yes — the heater core is relevant and used on the 1997 Pajero.

On a ’97 Pajero, the heater core is a small radiator tucked inside the heater box behind the dash. Engine coolant flows through it, and the cabin fan pushes air across its fins to deliver warm air for cold mornings and quick demisting. It’s simple, reliable, and it doubles as part of the engine’s thermal management by keeping coolant moving through the system even when the thermostat is closed.

Telltale signs it’s on the way out include a sweet coolant smell in the cabin, greasy film on the inside of the windscreen, damp carpet on the passenger side, a slow coolant loss with no external leak, gurgling behind the dash, or weak cabin heat. Catching issues early saves dramas, so regular cooling-system care goes a long way.

Good maintenance looks like this: refresh coolant every 2–4 years or 40,000–60,000 km with the correct ethylene glycol mix (typically 50/50 with demineralised water), bleed the system with the heater set to hot to purge air, and inspect heater hoses and clamps at the firewall. If the core’s partially blocked, a gentle back-flush can restore flow, but if it’s leaking or badly corroded, replacement is the only proper fix.

Replacing the heater core on a Gen 2 Pajero is a decent job — think dash removal and heater-box out. Plan a full day if you’re handy, or book it with a workshop. Typical steps are: disconnect the battery, drain coolant, remove lower trims/console, detach heater hoses at the firewall, slide out the heater unit, split the case, swap the core, and reassemble with new O-rings and foam seals. Refill with fresh coolant, bleed carefully, and pressure-test. Depending on how the HVAC cases are split, the air-con evaporator housing may need to be moved, any degas/re-gas must be done by a licensed air-con technician under AU/NZ regulations. It’s smart to replace aged heater hoses and clamps while you’re in there.

• Pro tips: use new hose clamps, check blend-door operation, and verify for dry carpets and no coolant smell after the first few drives.

Where is the heater core on a 1997 Pajero?

It sits inside the heater box behind the dashboard, roughly central and slightly towards the passenger side. Access is from inside the cabin, the unit is removed after taking out trims and the heater assembly.

What coolant should be used after a heater core replacement?

Use a quality ethylene glycol coolant that meets Mitsubishi specifications, mixed 50/50 with demineralised water. Always bleed with the heater set to hot to avoid airlocks that can cause poor heat or overheating.

Can the heater core be bypassed temporarily?

Yes, the inlet and outlet hoses at the firewall can be looped to get you home if the core leaks. It’s a temporary fix only — you’ll lose cabin heat and still need a proper replacement to prevent further issues.