Parts for your 2021 Suzuki Splash-Tx valve

2021 Suzuki Splash TX‑valve: what it does and how to look after it

Yes, the 2021‑registered Suzuki Splash uses a thermostatic expansion valve (TX‑valve) in its air‑conditioning system. That’s confirmed by Suzuki’s factory service information for the Splash/Ritz HVAC section, Suzuki’s electronic parts catalogue entries listing an “Expansion Valve (TX)”, and the related Opel Agila B workshop documentation (the Splash’s platform twin), all of which show a TX‑valve mounted at the evaporator inlet. General DENSO HVAC training material also notes that most Japanese passenger vehicles of this era use TX‑valves rather than fixed orifice tubes.

On this Splash, the TX‑valve meters liquid refrigerant into the evaporator and constantly trims flow to maintain proper superheat. That keeps the cabin cool without letting liquid refrigerant slug the compressor. When it’s doing its job, you get steady vent temps, quick pull‑down on hot days, and a compressor that lives a long, happy life.

There’s no scheduled replacement for the TX‑valve, it’s a fit‑and‑forget item unless there’s a fault or the system’s been opened. Typical symptoms of a dodgy valve include weak cooling at idle but better at road speed, icing at the valve or evaporator outlet, erratic vent temps, or pressure readings that don’t stack up during diagnostics.

• Diagnosis: Don’t just “gas it up”. Check condenser airflow, the cabin filter, and fan speeds first. Then use gauges and a thermometer to assess low/high‑side pressures and superheat.
• When replacing: Always recover refrigerant properly, renew the O‑rings with the correct HNBR items, torque the fittings to spec, and insulate the valve/sensing area as designed. Replace the receiver‑drier any time the system’s been opened or a compressor’s failed, and flush lines where appropriate.
• Access and labour: The TX‑valve sits at the evaporator inlet, typically behind the glovebox at the HVAC case where the lines pass through the firewall. Expect dash‑side access and a system evac/recharge. Budget a few hours in a workshop.
• Refrigerant: Most Splash vehicles of this generation were charged with R134a, always verify the exact type and charge weight on the under‑bonnet label.
• Compliance: In Australia, ARCtick‑licensed technicians must handle refrigerant. In New Zealand, use a suitably certified A/C specialist.

Look after airflow, fix leaks promptly, and use proper service procedures, and the Splash’s TX‑valve will usually go the distance without drama.

Popular questions about the 2021 Suzuki Splash TX‑valve

Where is the TX‑valve located on the Splash?
It’s mounted at the evaporator inlet, where the A/C pipes enter the HVAC case behind the dashboard. Most techs access it by removing the glovebox and trim to reach the evaporator connections at the firewall area.

Does the Splash use a TX‑valve or an orifice tube?
It uses a thermostatic expansion valve with a receiver‑drier, as shown in Suzuki service manuals and the Opel Agila B workshop documentation. That setup allows precise metering and stable cabin temps across varying loads.

When should the TX‑valve be replaced?
Only if it’s faulty (sticking, blocked, leaking) or the system’s contaminated after a compressor issue. Always replace the receiver‑drier, renew O‑rings, evacuate thoroughly, and recharge to the exact label spec when the system’s opened.