Parts for your 1988 Mitsubishi Pajero-Receiver driers

1988 Mitsubishi Pajero receiver-drier: what it does and when to replace it

Yes, the 1988 Mitsubishi Pajero uses a receiver-drier in its air‑conditioning system. Technical sources including the Mitsubishi Pajero/Montero Factory Service Manual (late 1980s, Group 55 Heating & Air Conditioning), the Mitsubishi ASA/EPC parts catalogue for L040-series Pajero, and general Denso HVAC service literature confirm the Pajero’s TXV (thermal expansion valve) layout with a receiver‑drier mounted near the condenser. Haynes’ Pajero/Montero repair manuals from the era also describe receiver‑drier replacement as part of A/C service.

On this model, the receiver‑drier is the small canister up front by the condenser. Its job is simple but critical: it stores a little liquid refrigerant, filters out muck, and, most importantly, pulls moisture from the system using a desiccant pack. That keeps only clean, dry liquid heading to the TX valve, so the evaporator runs cold and the compressor doesn’t cop a hiding from acid or ice crystals. Many Pajero units also carry a pressure or trinary switch on the body, and some variants came with a sight glass on top.

For a 1988 Pajero, replacement is good practice whenever the A/C circuit has been opened (hoses off, condenser/compressor changed), after a compressor failure, if the system’s been left open to air, or when retrofitting from R12 to R134a. Moisture is the enemy—once the desiccant is saturated, performance drops and corrosion can start inside the lines. If the service history’s hazy, a fresh drier is cheap insurance.

Tips for a tidy job on these old rigs:

• Always recover refrigerant legally, in Australia and New Zealand, A/C work must be done by a licensed technician.
• Match the ports and orientation arrows, don’t bend the hard lines at the condenser.
• Use the correct O‑rings and a smear of compatible refrigerant oil (mineral for R12 systems, ester/PAG as specified if converted to R134a).
• Pulldown with a vacuum pump for at least 30–45 minutes before re‑charge to boil off moisture.
• If fitted, transfer the pressure/trinary switch with new seals and check operation.

Common giveaway signs of a crook receiver‑drier on a Pajero include weak cooling on hot days, frosting near the TX valve, rapid compressor cycling, debris found at the TXV screen, or bubbly/foamy sight glass that never clears once charged correctly.

FAQs

Where is the receiver‑drier on a 1988 Pajero?
It’s typically mounted vertically near the front of the vehicle beside the condenser, behind the grille—look for a small cylindrical canister with two A/C lines and often a pressure switch plugged into it.

How often should it be replaced?
There’s no fixed kilometre interval. Replace it any time the system is opened, after compressor or condenser replacement, if the system has been exposed to air, or during an R134a retrofit. Otherwise, leave it be if performance is solid and the system is tight.

What refrigerant and oil should be used?
These Pajeros were born with R12 and mineral oil. Many have been converted to R134a—use the oil type specified for the compressor used in the conversion (often ester, sometimes PAG). A licensed tech should handle identification, recovery, and charging.