Parts for your 2000 Mitsubishi Pajero-Tx valve

2000 Mitsubishi Pajero TX Valve — What It Does and How to Look After It

Based on technical sources — including the Mitsubishi Pajero/Montero 1999–2006 Workshop Manual (Group 55A: Heating & Air Conditioning), Mitsubishi ASA electronic parts catalogue, and aftermarket application guides from Denso and Nissens — the 2000 Mitsubishi Pajero is fitted with a thermostatic expansion valve (TX valve). Models with rear air also use a second TX valve for the rear evaporator. So yes, a TX valve is relevant and used on this vehicle.

The TX valve is the brain of the Pajero’s air-con. It meters the flow of R134a into the evaporator, matching refrigerant to heat load and keeping superheat in the sweet spot. That helps cabin temps stay stable, prevents the evaporator from icing up, and protects the compressor from liquid slugging. On the 2000 Pajero, the primary TX valve sits at the evaporator inlet/outlet inside the HVAC case (behind the glovebox area). Dual A/C setups have an additional valve in the rear quarter with the rear evaporator.

It’s not a routine “service” item, but if cooling is weak or erratic, the TX valve is worth a look — especially on high‑kilometre vehicles or systems that have been opened before. Typical flags include poor cooling at idle, lines frosting at the firewall, rapid temperature swings, or pressures that don’t respond normally on the gauges.

• When replacing: always replace the receiver‑drier, renew O‑rings, and flush lines if contamination or compressor failure is suspected.
• Use the under‑bonnet decal for the exact R134a charge, incorrect charge can mimic TX valve faults.
• On single vs dual A/C: confirm whether the vehicle has a rear unit, as charge amount and parts differ.
• Leak test, evacuate properly (deep vacuum), and weigh the charge — guesswork leads to mediocre cooling.
• Secure any sensing bulb or capillary as per the workshop manual, and avoid overtightening the block fittings.

Because refrigerant handling is regulated, the job’s best left to an ARCtick‑licensed tech in Australia or a certified A/C technician in New Zealand. A good shop will check condenser airflow, cabin filter (if fitted), blower performance, and fan operation before condemning the TX valve — plenty of “no cool” complaints are airflow, not metering, issues.

Where is the TX valve on a 2000 Mitsubishi Pajero?

It’s mounted at the evaporator connections inside the HVAC box, typically accessed by removing the glovebox and trim on the passenger side. On Pajeros with rear A/C, there’s a second TX valve at the rear evaporator in the rear quarter panel area.

How can someone tell if the TX valve is faulty?

Clues include weak cooling at idle, icing on the evaporator pipes, rapid cycling, or gauge readings that show very high or very low superheat. Verification requires proper manifold gauges and temperature checks, a licensed A/C tech can confirm before replacing parts.

Should the TX valve be replaced when the compressor is changed?

It’s smart to replace the receiver‑drier and flush the system whenever a compressor is changed. Replace the TX valve if there’s debris, acid formation, or evidence it’s sticking. On clean systems with a confirmed good TX valve, it doesn’t have to be replaced by default.