Parts for your 2022 Mazda Cx-5-Tx valve

2022 Mazda CX-5 TX Valve — Purpose, Care, and When to Replace

Based on technical documentation, the 2022 Mazda CX‑5 is fitted with a thermostatic expansion valve (TX valve/TXV). The Mazda CX‑5 (KF) Workshop Manual HVAC section identifies an expansion valve at the evaporator, and Mazda’s Electronic Parts Catalogue lists an “A/C expansion valve” for 2017–2023 CX‑5 models. This aligns with DENSO‑type HVAC layouts commonly used by Mazda, where a TXV meters refrigerant into the evaporator.

What does the TX valve do? It’s the traffic controller for refrigerant flow, keeping evaporator “superheat” on target so the system cools hard without flooding liquid back to the compressor. It reacts to load and ambient changes — stuck in traffic, belting down the motorway, or copping a hot Aussie/Kiwi summer, it trims flow to keep cabin temps comfy and stable.

It’s not a routine service item, but it does benefit from the rest of the A/C system being in good nick. Running the A/C regularly, keeping the cabin filter fresh, and ensuring the condenser is clean all help the TXV do its job with less stress.

• Signs it’s time to check the TX valve:
  • Slow or uneven cooling, especially at idle or after a hot soak
  • Vent temps swinging hot–cold, or light frosting on the low‑side line
  • Odd hissing plus pressure readings that don’t match conditions

Replacement is a licensed tech job — refrigerant must be recovered, not vented. Access is at the evaporator connection near the firewall, depending on tooling and model variant, cowl/trim removal may be needed. In Australia and New Zealand, use an ARCtick‑licensed technician.

• Best practice when replacing the TX valve:
  • Confirm the refrigerant type on the under‑bonnet label (many 2022 CX‑5s use R‑1234yf, some markets still show R‑134a)
  • Replace O‑rings and lightly oil with the specified PAG (per Mazda service data)
  • Replace/renew the receiver‑drier (often integrated in the condenser) if the system has been opened or after compressor damage
  • Pressure test with nitrogen, deep‑vacuum, and charge by weight to the label spec

If the compressor has failed or there’s debris in the lines, the TXV can clog — in that case, it’s wise to flush what’s flushable, fit a new condenser/drier, and replace the valve to protect the new compressor. Done right, the CX‑5’s TX valve will tick along quietly for years, delivering chilly air with no dramas.

FAQs

Does the 2022 Mazda CX‑5 have a TX valve?
Yes. Workshop manual references for the KF series and Mazda parts listings show a thermostatic expansion valve at the evaporator. It’s part of the DENSO‑style A/C setup used on this model.

When should the TX valve be replaced?
There’s no scheduled interval. Replace it if cooling is erratic, pressures are off despite correct charge, there’s line frosting, or after a compressor failure that may have sent debris through the system.

What refrigerant and oil does it use?
Market‑dependent. Many 2022 CX‑5s use R‑1234yf, some use R‑134a. Check the under‑bonnet label. Use the Mazda‑specified PAG oil type/quantity noted in the service data for your exact refrigerant.