Parts for your 1991 Mitsubishi Pajero-Cabin filter

1991 Mitsubishi Pajero cabin filter — what owners should know

The 1991 Mitsubishi Pajero didn’t leave the factory with a cabin (pollen) filter. Technical sources back this up: the HVAC diagrams in the factory service manual show no filter element or service access, the Mitsubishi ASA electronic parts catalogue for the V2/V4/V6 second‑gen models (NH, NJ, NK, NL) lists no “air refiner” or cabin filter part, and the owner’s maintenance schedule for these years doesn’t include a cabin or A/C filter item. In short, there’s nothing to replace because the HVAC case was never designed with a filter slot.

Why wasn’t a filter used? In the early ’90s, many 4x4s prioritised strong airflow and simplicity for hot climates and outback conditions. The Pajero draws fresh air through the cowl grille under the windscreen, where a coarse mesh stops leaves and big debris, then straight through the evaporator and heater core. Adding a fine filter would have restricted flow and demanded regular servicing that most markets of the day didn’t expect. The design keeps things robust, but it also means fine dust and pollen can get through more easily than on newer vehicles.

Owners chasing cleaner cabin air still have options. A common mod is to fabricate a slot in the blower/evaporator case and fit a universal or later‑model filter panel, but that’s a custom job and not a Mitsubishi‑approved retrofit. Most drivers stick with preventative maintenance: keep the cowl intake clear of leaves, run the system on recirculate on dusty tracks, and freshen the evaporator with an A/C foam cleaner every year or so to tame odours and muck.

• Use recirculate on dirt roads or when following traffic to cut dust and fumes.
• Vacuum and wipe the cowl intake area, ensure drains and plenum chambers are clear.
• Periodically clean the blower fan and evaporator face with suitable A/C cleaners.
• Replace the cabin’s interior filter equivalent? Not applicable—no factory provision exists.

Technical references consulted:

• Mitsubishi Pajero (NH–NL, 1991–1999) Factory Service Manual, Group 55A: Heater, Air Conditioner and Ventilation — no cabin filter shown or serviced.
• Mitsubishi ASA Electronic Parts Catalogue (General Export/Australia & NZ), Models V2W/V23W/V24W/V25W/V26W — no cabin/pollen filter or “air refiner” listing.
• Pajero Owner’s Handbook (NH/NJ series) — maintenance schedule contains no cabin or A/C filter replacement item.
• Gregory’s/Haynes Pajero 1991–1996 repair manuals — HVAC service procedures omit any cabin filter service step.

FAQs

Does a 1991 Mitsubishi Pajero have a cabin filter?
No. The second‑gen Pajero (NH/NJ/NK/NL) wasn’t built with a cabin or pollen filter, and there’s no factory service procedure or part number for one.

Can a cabin filter be retrofitted to a 1991 Pajero?
It’s possible as a custom modification by cutting a slot in the HVAC case and fitting a universal panel, but it’s not an OEM kit. Expect trimming, sealing, and occasional filter changes to maintain airflow. Most owners instead maintain the cowl intake and use recirculate on dusty roads.

How can they reduce dust and smells without a filter?
Keep the cowl intake clear, run recirculate when it’s dusty or smoky, clean the blower and evaporator with A/C foam cleaner annually, and check cabin seals. These steps improve air quality without the pressure drop a fine filter would add.