Parts for your 2017 Mitsubishi Lancer-Tx valve

2017 Mitsubishi Lancer TX-valve: purpose, fitment and service tips

Based on technical sources, the 2017 Mitsubishi Lancer is fitted with a TX‑valve (thermostatic expansion valve). The Mitsubishi Lancer Service Manual (Air Conditioning/Heater group) specifies a thermostatic expansion valve at the evaporator inlet, the Mitsubishi ASA electronic parts catalogue for CF/CJ Lancer lists an “Expansion Valve, Air Conditioner” for 2015–2017 builds, and major HVAC parts catalogues (DENSO, Nissens, Four Seasons) all supply a block‑style expansion valve for this model. So yes—on a 2017 Lancer, the TX‑valve is relevant and used.

On this Lancer, the TX‑valve meters the flow of refrigerant into the evaporator based on superheat, keeping vent temps steady and helping the compressor avoid liquid slugging. In Aussie and Kiwi conditions—scorchers one day, southerlies the next—the TX‑valve keeps the cabin comfortable by matching refrigerant flow to heat load. It’s part of a DENSO‑type system that pairs a TX‑valve with a receiver‑drier (often integrated in the condenser).

There’s no set service interval just for the TX‑valve. It’s typically inspected or replaced when there’s poor A/C performance, after a contamination event (desiccant breakdown, compressor failure), or when the evaporator or lines are off for other work. Tell‑tale signs of a TX‑valve issue include:

• Warm air at idle but cooler on the move
• Rapidly fluctuating vent temperatures
• Frosting at the evaporator inlet or a hissing/whistling under the dash
• Abnormal high/low‑side pressures on gauges

When replacement is required, a licensed A/C technician should recover the refrigerant, remove the lines at the bulkhead/evaporator, and swap the block valve with new HNBR O‑rings lightly lubricated in the specified PAG oil. Use factory torque specs, evacuate the system thoroughly (deep vacuum) to remove moisture, then recharge with the correct refrigerant and oil quantity as per the under‑bonnet label (many 2017 Lancers specify R‑134a). If the system’s been open or a compressor let go, plan on replacing the receiver‑drier and performing contamination control (flushing where appropriate, and fitting an inline filter if advised).

Owners should lean on an ARCtick‑licensed technician in Australia or a certified handler in New Zealand. Done right, a fresh TX‑valve restores crisp, consistent cooling and protects the compressor—nice and comfy for the daily commute.

Popular questions about the 2017 Mitsubishi Lancer TX‑valve

Where is the TX‑valve located on a 2017 Lancer?
It’s mounted at the evaporator inlet—behind the dash near the firewall. Access typically involves disconnecting the A/C lines at the engine bay bulkhead and removing the glovebox/evaporator housing to reach the block‑style valve.

Does the 2017 Lancer use a TX‑valve or an orifice tube?
This model uses a TX‑valve. Unlike a fixed orifice tube, the TX‑valve modulates refrigerant flow based on evaporator outlet temperature/superheat, which improves comfort, efficiency, and compressor protection.

When should the TX‑valve be replaced, and what does it cost?
Replace it when diagnosed as restricted or stuck, during major A/C repairs, or after contamination. Parts are usually modest in cost, but labour and re‑gas add up. As a ballpark in AU/NZ: 1.5–3.0 hours labour plus refrigerant and consumables, exact pricing varies by workshop.