Parts for your 2024 Mitsubishi Asx-Tx valve

2024 Mitsubishi ASX TX Valve: What it does and how to look after it

Yes — the 2024 Mitsubishi ASX as sold in Australia and New Zealand uses a TX (thermal expansion) valve in its air-conditioning system. This is documented in Mitsubishi Motors service literature for the ASX/RVR (Group 55A Heating & Air Conditioning), which specifies an expansion valve at the evaporator inlet, and is supported by major aftermarket catalogues from OEM suppliers like DENSO and Nissens that list a direct-fit A/C expansion (TX) valve for ASX model years 2010 through current builds. The Euro-market ASX (Captur-based) also follows the same principle, with an expansion valve shown in the Renault Captur II parts listings, reinforcing that a TX valve is the norm for this platform family.

On the ASX, the TX valve meters refrigerant into the evaporator based on temperature and pressure, so the cabin gets steady, efficient cooling without the system hunting or icing up. By matching refrigerant flow to heat load, the valve helps the compressor work less hard, keeps vent temps consistent, and avoids the fuel and performance penalties of an overworked A/C loop.

For servicing, a TX valve isn’t a scheduled replacement item, it’s replaced when faulty or after certain major A/C repairs. Typical clues it’s on the way out include:

• Weak or erratic cooling, especially at idle or in traffic
• Frost or sweating on the evaporator pipes/valve body
• Unusual high/low-side pressure readings during diagnosis
• Rapid cycling of the compressor and fluctuating vent temps

If the valve needs changing, a licensed technician should recover the refrigerant, remove the valve at the evaporator inlet, renew all O-rings, and torque fasteners to spec. It’s good practice to replace the receiver–drier or desiccant pack (often integrated with the condenser on later ASX variants) any time the system is opened, then evacuate and recharge with the exact refrigerant type and charge shown on the under‑bonnet label. Where applicable, balance the compressor oil per the service manual.

Smart maintenance on an ASX air‑con includes keeping the cabin filter fresh, ensuring condenser fins are clean and straight, and running the A/C regularly year‑round. That keeps the TX valve, compressor and seals happy, so the system holds pressure, cools quickly, and avoids the classic “works on the highway but not in town” complaint.

Popular questions about the 2024 Mitsubishi ASX TX valve

Where is the TX valve on a 2024 Mitsubishi ASX?
It’s mounted at the evaporator inlet, typically accessed from the engine bay side of the firewall on the ASX. On some trims, limited trim removal or cowl access may be needed. A technician will confirm location via the service manual diagram before removal.

What symptoms point to a failing TX valve on an ASX?
Tell‑tales include poor cooling at idle, fluctuating vent temperatures, frosting on the valve or evaporator pipes, and abnormal manifold gauge readings. These can overlap with compressor or condenser faults, so proper A/C diagnostics are essential before parts are replaced.

Do you have to replace the receiver–drier when changing the TX valve?
Best practice is yes. Any time the system is opened, moisture control is critical. On many ASX variants the drier is built into the condenser, the desiccant bag can be serviced or the condenser replaced depending on configuration and condition.