Parts for your 2001 Mitsubishi Pajero-Tx valve

2001 Mitsubishi Pajero TX Valve — what it does and when to service it

Yes, the 2001 Mitsubishi Pajero uses a TX valve (thermostatic expansion valve) in its air-conditioning system. This is confirmed by Mitsubishi Motors’ Workshop Manual for the 2000–2002 Pajero/Montero (HVAC/Group 55A), which specifies an expansion valve at the evaporator, and by major component catalogues from Denso and Nissens that list front—and on dual‑air models, rear—TX valves for this vehicle. So the TX valve is absolutely relevant on a 2001 Pajero, including NM/early NP models across petrol and Di‑D diesel variants.

The TX valve’s job is to meter refrigerant into the evaporator, reacting to temperature/pressure so the evaporator runs cold without freezing. When it’s healthy, you get crisp, consistent cabin temps and happy summer road trips. When it’s tired or blocked, you cop warm air at idle, erratic vent temps, or frosty pipes and poor demisting.

For servicing, the TX valve sits at the evaporator inlet (behind the dash for the front unit, at the rear quarter for vehicles with rear A/C). It’s not a routine “every service” swap, but it should be assessed any time the system is open, performance is down, or contaminants/moisture are suspected. Best practice when replacing a TX valve includes:

• Recovering refrigerant with an ARCtick‑licensed (AU) or qualified (NZ) technician.
• Replacing the receiver–drier/desiccant and all disturbed O‑rings.
• Flushing lines if there’s debris, then evacuating the system to deep vacuum.
• Recharging with R‑134a to the spec on the under‑bonnet label (dual A/C uses more).

Common clues the Pajero’s TX valve needs attention include a hissing or hunting system, high low‑side pressure/low high‑side pressure, or frosting at the valve/outlet tube. Because access to the front evaporator is labour‑heavy, owners often choose to refresh the TX valve and evaporator core together if there’s any sign of internal corrosion or leak. Use quality parts matched to the VIN, torque the flare fittings correctly, and pressure‑test before re‑gassing. A quick cabin filter check and condenser clean will help the TX valve do its best work and keep the air‑con chilly for thousands of kilometres.

Popular questions about 2001 Mitsubishi Pajero TX valves

Does a 2001 Pajero have one or two TX valves?
Most have a single front TX valve. Models optioned with rear air-conditioning have a second TX valve at the rear evaporator.

Where is the TX valve located on a 2001 Pajero?
The front TX valve mounts at the front evaporator behind the dash (passenger side on most RHD models). On dual‑air vehicles, the rear TX valve sits near the rear evaporator in the right‑hand rear quarter.

Do I need to replace the receiver–drier when changing the TX valve?
Yes. Any time the system is opened, replace the receiver–drier/desiccant and O‑rings, then evacuate and re‑gas to spec for reliable, dry, cold operation.