Parts for your 2006 Mitsubishi Lancer-Tx valve

2006 Mitsubishi Lancer TX-Valve: What it does and when to service it

Yes, the 2006 Mitsubishi Lancer uses a TX-valve (thermostatic expansion valve) in its air-conditioning system. This is confirmed by technical sources including the Mitsubishi Motors Lancer (CS/CH/CT, 2002–2007) Workshop Manual, Group 55A – Air Conditioning, which specifies a thermostatic expansion valve mounted at the evaporator inlet, and the Mitsubishi ASA electronic parts catalogue, which lists an expansion valve for 2006 Lancer variants. General repair manuals (e.g., Haynes/Autodata HVAC sections) for this model family also detail a TXV-equipped R134a system.

On a 2006 Lancer, the TX-valve sits at the firewall on the evaporator side, modulating refrigerant flow into the evaporator. Its job is to keep the evaporator just cold enough for solid cooling without freezing up, by adjusting flow to match heat load. That’s why a healthy TX-valve delivers quicker cool-downs in Aussie and Kiwi summers and steadier temps without the cabin see-sawing from too warm to too icy.

Over time, a TX-valve can stick, clog with debris or moisture, or lose its responsiveness. That shows up as weak or intermittent cooling, evaporator icing, short-cycling, or high/low side pressures that don’t look right on the gauges. If the compressor failed previously or the system’s been open to air, the valve is far more likely to be contaminated.

• Best practice when replacing the TX-valve is to also replace the receiver-drier (or desiccant), renew O-rings, evacuate to deep vacuum, and recharge to the correct R134a weight and PAG oil spec.
• Because the valve is at the evaporator, access usually involves removing the glovebox/trim and carefully disconnecting the lines at the firewall. Follow the factory torque specs and use proper line wrenches.
• If the system’s cooling has faded gradually, rule out condenser airflow, cabin filter blockage, and low refrigerant before condemning the TX-valve.

For everyday servicing of a 2006 Lancer’s air-con, a performance check each 12–24 months is smart: inspect for oily residue at hose joints, verify clutch engagement and fan operation, and look for frosting on the low line. If the system’s been opened or moisture is suspected, don’t drive it long—moisture can form acids that attack the TX-valve and compressor. A tidy, leak-free, correctly charged system will let the Lancer’s TX-valve do its job quietly for years.

Popular questions

Where is the TX-valve on a 2006 Mitsubishi Lancer?
It’s mounted at the evaporator inlet, right at the firewall on the passenger side. Access is typically from behind the glovebox for the valve body and from the engine bay for the line fittings. Expect to remove trim panels and carefully disconnect the A/C lines with the system safely recovered first.

What are the symptoms of a failing TX-valve?
Common signs include weak cooling at idle, temperature swings, evaporator icing, a hissing valve that never settles, and odd gauge readings—often low suction with normal to high discharge. If the compressor or drier has recently been replaced and cooling is still off, a sticky or blocked TX-valve is a prime suspect.

Do I need to regas after replacing the TX-valve?
Yes. Any time the system is opened, it must be recovered, evacuated to deep vacuum, and recharged with the correct R134a and PAG oil quantity. Skipping the vacuum and exact charge will hurt cooling performance and can shorten component life.