Parts for your 2002 Mitsubishi Lancer-Tx valve

2002 Mitsubishi Lancer TX valve: what it does and when to service it

Yes, the 2002 Mitsubishi Lancer runs a thermostatic expansion valve (TX valve/TXV) in its factory R134a air-con system. This isn’t an orifice-tube setup. Technical references that document this include the Mitsubishi Lancer CG/CH Service Manual (Group 55A Heating & Air Conditioning), which shows the expansion valve mounted at the evaporator, and the Mitsubishi ASA parts catalogue listings for “Valve, expansion” on 2002 Lancer models. General DENSO HVAC training material also notes Mitsubishi passenger cars of this era commonly use TXVs with a receiver-drier.

The TX valve meters liquid refrigerant into the evaporator, based on evaporator outlet temperature and pressure. By balancing the superheat, it keeps the evaporator cold without letting it ice solid, so cabin temps stay comfy and the compressor isn’t overworked. When a TXV sticks or goes out of spec, the car might feel icy one minute and ordinary the next, especially at idle or on hot days.

• Typical symptoms of a crook TX valve: weak cooling at idle but better on the move, evaporator or pipes frosting, compressor short-cycling, hissing at the firewall, or scan-gauge/pressure readings showing very high high-side and very low low-side pressures.
• Good service practice: replace the receiver-drier whenever the system is opened, renew all O-rings, add the correct PAG oil amount, evacuate thoroughly, and recharge by weight.

On the 2002 Lancer, the TX valve is fitted at the evaporator block inside the HVAC case behind the glovebox/firewall area. Access usually means removing glovebox trim and the evaporator cover. Because the system must be recovered and recharged properly, this job’s best left to an ARCtick-licensed tech. Expect around 2–4 hours of labour depending on access and any seized fasteners. If metallic debris or sludge is found, the shop will likely recommend flushing, a new drier, and checking the compressor before fitting a fresh valve.

A TX valve isn’t a routine “replace by kilometres” item. Leave it alone if cooling performance and pressures are spot on. Consider replacement when diagnosing poor cooling after ruling out low gas, condenser airflow issues, blend door faults, or a failing compressor clutch. Always torque fittings to the workshop manual spec and leak-check with nitrogen before recharging with R134a.

Technical sources consulted: Mitsubishi Lancer CG/CH Service Manual (Group 55A Heating & Air Conditioning), Mitsubishi ASA Electronic Parts Catalogue (expansion valve listing for 2002 Lancer), DENSO Automotive Air Conditioning Fundamentals, and general workshop references such as Haynes/Autodata for procedure guidance.

FAQs

Does a 2002 Mitsubishi Lancer use a TX valve or an orifice tube?
It uses a TX valve mounted at the evaporator, not an orifice tube. This layout gives tighter control of evaporator superheat and steady cabin temps in Aussie and Kiwi conditions.

Where is the TX valve on a 2002 Lancer and how hard is it to replace?
It’s on the evaporator block inside the HVAC case behind the glovebox/firewall area. Replacement needs refrigerant recovery, trim removal, new O-rings, evacuation and recharge. Budget 2–4 hours with an ARCtick-licensed technician.

Should the receiver-drier be replaced when changing the TX valve?
Yes. Any time the system’s opened, best practice is to fit a new receiver-drier, renew O-rings, add the correct PAG oil, and perform a vacuum and leak test before recharging.