Parts for your 1989 Mitsubishi Pajero-Receiver driers

1989 Mitsubishi Pajero Receiver‑Drier

Technical sources confirm the 1989 Mitsubishi Pajero is fitted with a receiver‑drier as part of its factory air‑conditioning. The Mitsubishi Pajero (L040 series) Factory Service Manual, Heating & Air Conditioning section, diagrams a high‑side receiver‑drier feeding a thermal expansion valve (TXV). Mitsubishi’s electronic parts catalogue (ASA) lists a receiver‑drier assembly for 1988–1990 Pajero/Montero models, and general references like the Haynes Pajero/Montero 1983–1996 A/C chapter and Sanden compressor application data also describe this model’s R12, TXV‑style system—i.e., a system that uses a receiver‑drier rather than an accumulator.

On a 1989 Pajero, the receiver‑drier does three important jobs: it stores liquid refrigerant on the high side so the TXV is fed a steady supply, it traps debris that could damage the TXV or compressor, and, crucially, it pulls moisture out of the refrigerant using a desiccant. Moisture is the enemy inside A/C plumbing—left alone it forms acids and ice, which can seize valves and chew out compressors.

As part of regular servicing, a Pajero’s receiver‑drier is considered a consumable. It should be replaced any time the A/C circuit is opened or the system has been flat for a while. Good workshops in Australia and New Zealand will also recommend a new drier when converting from R12 to R134a, or after a compressor failure.

• Replace the receiver‑drier when the system is opened, after compressor failure, during R12→R134a conversion, or if the vehicle has had poor cooling and contamination is suspected.
• Always fit new O‑rings, lightly lubricated with the correct oil, and torque fittings correctly.
• Have the system evacuated, leak‑tested, and recharged by a licensed A/C technician (ARCtick in Australia, licensed handler in NZ).

For an R134a conversion, choose a drier with R134a‑compatible desiccant (commonly XH‑9) and replace any pressure switch or brackets over to the new canister if required. Use an oil that suits the conversion and compressor—POE is often chosen for conversions due to better compatibility with residual mineral oil, while many later compressors specify PAG. Your technician will recover refrigerant, vacuum the system, add the correct oil charge, and recharge by weight to spec.

Typical signs a Pajero’s receiver‑drier is past it include intermittent or weak cooling, a TXV that freezes, metallic debris caught at the drier outlet, or moisture indicators (if fitted) showing saturation. Given the age of an ’89 truck, if there’s any doubt, a fresh drier is cheap insurance for keeping the cabin cool when the mercury climbs.

• Where is the receiver‑drier on a 1989 Pajero?

It’s typically mounted in front of the radiator/condenser area, behind the grille on the passenger‑side (RHD models), as a small vertical canister with two A/C lines and often a pressure switch. Access is usually from the front with the grille or top cover removed.

• How often should the receiver‑drier be replaced?

Replace it whenever the A/C system is opened, after a compressor failure, during R12→R134a conversion, or if the system has been empty or exposed to air. On older vehicles like an ’89 Pajero, proactive replacement every few years is sensible, especially before summer.

• Do I need a different drier when converting to R134a?

Yes—use a receiver‑drier with R134a‑compatible desiccant and new O‑rings. Your technician will also flush, check the TXV, add the correct oil (often POE for conversions), evacuate, and recharge by weight for reliable, cold performance.