Parts for your 2022 Subaru Impreza-Tx valve

2022 Subaru Impreza TX Valve: what it does and how to look after it

Yes, the 2022 Subaru Impreza uses a thermostatic expansion valve (TX valve/TXV) in its air‑conditioning system. Technical sources that identify the TX valve on this model include Subaru’s factory Service Manual for Impreza (MY17–MY22) under Air Conditioner > Expansion Valve, and the Subaru parts catalogue which lists a block‑type expansion valve mounted at the evaporator for the 2022 Impreza. Industry servicing guidance (e.g., SAE J639 and R‑1234yf service practices) also aligns with the TXV layout used by Subaru on late‑model Impreza.

The TX valve meters refrigerant into the evaporator based on outlet temperature and pressure, keeping the evaporator just cold enough to absorb heat without freezing. That precise control is why cabin temps stay steady, why demist performance is decent on a wet morning, and why the compressor doesn’t work harder than it has to.

As part of routine servicing, a quick check of TXV performance is smart if the air‑con feels off. Typical clues include weak cooling at idle but better on the open road, the evaporator icing and airflow dropping, or pressures that look wrong on gauges (very low suction or hunting high/low). Because the 2022 Impreza uses R‑1234yf, any diagnosis, recovery and recharge should be done with the right, certified equipment—don’t top up with a DIY can.

If the TX valve needs replacing, a competent air‑con technician will:

• Recover the refrigerant and access the TX valve at the evaporator block (behind the dash/at the HVAC case).
• Replace the TXV and all related O‑rings, lightly oiling new seals with the correct PAG oil grade.
• Leak‑test, evacuate, and recharge to the precise mass shown on the under‑bonnet label (R‑1234yf).
• Verify outlet temps and pressure stability, check blower performance and the cabin filter while they’re there.

Good habits help the TXV and the rest of the system last: run the air‑con regularly year‑round to circulate oil, change the cabin filter on schedule so airflow across the evaporator stays healthy, and address any strange hissing, cycling, or damp smells early before moisture or debris cause valve sticking. If the system’s been open to atmosphere or badly contaminated, consider replacing the condenser’s integrated desiccant (where applicable) and flushing lines as per Subaru procedure. That way, the TX valve isn’t fighting metal fines or sludge and the Impreza keeps its cool through Aussie summers and Kiwi nor’westers alike.

• Popular questions about the 2022 Subaru Impreza TX valve

Does the 2022 Impreza use a TX valve or an orifice tube?
It uses a TX valve mounted at the evaporator. Subaru’s service information for MY17–MY22 Impreza specifies a block‑type expansion valve rather than a fixed orifice tube, which suits the variable load conditions and R‑1234yf system design.

What symptoms point to a failing TX valve on a 2022 Impreza?
Expect weak cooling at idle, temperature swings, evaporator icing, or pressure readings that are abnormally low or “hunting.” A stuck‑open valve can flood the evaporator, stuck‑closed or debris‑blocked valves starve it. Always confirm with proper gauges and temperature checks.

Can a home mechanic replace the TX valve?
Not recommended. The job requires refrigerant recovery, correct PAG oil handling, precise evacuation and a by‑mass R‑1234yf recharge. Incorrect charging or contamination can damage the compressor. Best left to an ARCtick‑licensed (AU) or certified (NZ) air‑con technician.