Parts for your 2003 Mitsubishi Pajero-Tx valve

2003 Mitsubishi Pajero TX‑Valve: what it is and how to look after it

Technical sources confirm the 2003 Mitsubishi Pajero uses a thermal expansion valve (TX‑valve) in its factory A/C system. Mitsubishi Motors workshop documentation for Pajero (V60/V70 series) HVAC identifies an expansion valve at the evaporator inlet, the Mitsubishi ASA electronic parts catalogue lists an expansion valve for 2003 Pajero variants, and major aftermarket catalogues (e.g. DENSO) specify a replacement TX‑valve for these models. So yes — a TX‑valve is fitted and relevant on a 2003 Pajero.

On a 2003 Pajero, the TX‑valve meters the flow of R134a into the evaporator based on temperature/pressure, keeping cabin temps comfy without the system icing up or running inefficiently. It sits at the evaporator—typically accessed from behind the glovebox area—acting like a smart tap that only lets in the right amount of refrigerant as driving and weather conditions change.

Owners eyeing a service or chasing weak cooling will want to keep the TX‑valve on the checklist. It’s not a regular “wear” item like a cabin filter, but it can clog with debris or stick internally, especially after compressor wear or moisture ingress. A crook TX‑valve can show up as:

• Slow or uneven cooling, especially at idle or in traffic
• Evaporator icing or frosty lines under the bonnet
• Hissing at the evaporator area and odd pressure readings on gauges

If the system’s been open (after a hose, condenser or compressor job), best practice is to replace the receiver/drier and O‑rings, evacuate thoroughly, and confirm the TX‑valve isn’t restricted. If contamination’s suspected, a new valve is cheap insurance against repeat faults.

Replacing the TX‑valve is a straightforward job for an A/C tech: recover refrigerant, remove the glovebox/evap cover, swap the valve and O‑rings, torque to spec, evacuate for a solid 30+ minutes, then recharge to the exact fill shown on the under‑bonnet label with the correct PAG oil balance. Skipping the vacuum stage or guessing the charge can leave the Pajero blowing lukewarm air or short‑cycling.

For day‑to‑day care, keep the cabin filter fresh, run the air‑con regularly year‑round to circulate oil, and check for any oily residue at hose joints that hints at leaks. If the system’s still not keeping its cool, a pressure/temperature check and a look at the TX‑valve performance is the next logical step.

FAQs

Where is the TX‑valve on a 2003 Pajero?
It’s mounted at the evaporator inlet, typically behind the glovebox. Access usually involves removing the glovebox and the evaporator case cover. A/C lines pass through the firewall to the valve, so you’ll see it where the lines meet the evaporator block.

When should the TX‑valve be replaced?
Replace it if it’s sticking or blocked, after a major compressor failure, or whenever the system’s been contaminated with debris or moisture. If you’re doing multiple A/C components, it’s smart to fit a new TX‑valve and receiver/drier together to avoid callbacks.

Is a weak air‑con always the TX‑valve?
Not always. Low refrigerant, a failing condenser fan, a dirty cabin filter, or a tired compressor can all mimic TX‑valve issues. A proper diagnosis with gauges and temperature readings will confirm whether the valve’s metering correctly before parts get swapped.