Parts for your 2019 Mitsubishi Eclipse cross-Tx valve

2019 Mitsubishi Eclipse Cross TX Valve: What it does and when to service it

Based on Mitsubishi technical documentation, a thermostatic expansion valve (TX valve, also called an A/C expansion valve) is fitted to the 2019 Mitsubishi Eclipse Cross. The Mitsubishi Motors Service Manual for Eclipse Cross (GK series) HVAC shows an “A/C expansion valve” at the evaporator inlet, and the Mitsubishi electronic parts catalogue (ASA/EPC) lists an expansion valve for MY2019 under the Heating & A/C group. That makes the TX valve relevant to servicing and fault diagnosis on this model.

The TX valve’s whole job is metering exactly how much liquid refrigerant enters the evaporator. It reacts to evaporator outlet temperature and pressure (superheat) via its sensing bulb and internal diaphragm, trimming flow so the coil stays cold without flooding the compressor. On the Eclipse Cross, that means better cabin cool-down, steadier vent temps on hot Aussie and Kiwi days, and less compressor stress when you’re stuck in traffic or giving it a squirt up a hill.

It’s not a regular “replace at X kilometres” item, but it’s absolutely part of smart A/C servicing. If the valve sticks open, you’ll often get poor cooling and possible evaporator icing, stick closed or restricted, and you’ll feel weak airflow cooling with high low-side pressures dropping off, plus a noisy, unhappy compressor. Contamination from a failed compressor or moisture in the system can gum up the valve, so any time the A/C circuit is opened, insist on proper evacuation, correct oil balancing, new O-rings, and replacing the receiver–drier or desiccant bag as specified. Use the exact refrigerant charge shown on the under-bonnet label (some markets are R-1234yf, others R-134a) because charge accuracy directly affects TX valve behaviour.

Replacing the TX valve on a 2019 Eclipse Cross is a pro job. The valve sits at the evaporator inlet within the HVAC housing, depending on trim and market, access can be tight and may involve interior disassembly to reach the joint block. Expect several hours of labour, recovery of refrigerant, system opening, valve swap with new O-rings, deep vacuum, then a precise recharge and leak check. A licensed air-con technician with an A/C station should handle it. After replacement, confirm stable vent temps, correct high/low-side pressures, and no line frosting beyond the evaporator outlet—signs your TX valve is doing its thing.

For owners, the best maintenance is simple: run the A/C regularly year-round, service the cabin filter so airflow across the evaporator stays healthy, and book an A/C performance check if cooling drops off, there’s a hissing at the dash, or the compressor cycles oddly. Catching TX valve and refrigerant issues early can save a compressor and a bigger bill.

• Where practical, request UV dye or electronic leak detection during A/C checks.
• After any A/C repair, ask for a printout of charge weight and pressures.

FAQ

Where is the TX valve on a 2019 Eclipse Cross?
The TX valve is mounted at the evaporator inlet within the HVAC unit. Access varies by market and trim, it’s typically reached by working at the evaporator connection block, which may require interior trim removal. A licensed technician will recover the gas, open the joint, replace the valve and O-rings, then evacuate and recharge.

What symptoms point to a failing TX valve?
Poor cooling at idle or cruise, temperature swings at the vents, evaporator icing, or a compressor that short-cycles can all hint at a sticky or restricted valve. Pressure readings that don’t stabilise, along with signs of contamination or moisture in the system, strengthen the case. Proper diagnosis with gauges and thermometers is essential.

Does refrigerant type affect TX valve service?
Yes. The Eclipse Cross may use R‑1234yf or R‑134a depending on market, the label under the bonnet confirms it. Charge amount and oil type/quantity are critical for correct TX valve operation. Always use the specified refrigerant and charge weight to avoid over- or underfeeding the evaporator.