Parts for your 2009 Holden Commodore-Tx valve

2009 Holden Commodore TX Valve — what it is, why it matters, and when to replace it

Yes, a TX valve is fitted to the 2009 Holden Commodore (VE). Technical sources including the Holden VE Commodore Service Manual (HVAC section), GM Global Service Information for the VE platform, and GM/ACDelco parts catalogues specify a thermal expansion valve (TXV) metering refrigerant into the evaporator on these R134a systems. That means the TX valve is relevant to any A/C service or repair on this model.

The TX valve’s job is simple but critical: it meters the precise amount of liquid refrigerant into the evaporator based on temperature at the outlet (superheat). By doing that, it keeps the evaporator cold without flooding it, protects the compressor from liquid slugging, and stabilises vent temperatures whether it’s idling in summer traffic or cruising down the motorway. When the TX valve sticks, ices up, or is contaminated, you’ll usually feel weak or inconsistent cooling, notice frost on the small line, or see odd high/low pressure readings on the gauges.

While the valve itself isn’t a routine “service item”, it absolutely deserves attention during A/C work. If the system’s been open to atmosphere, the compressor has failed, or there’s debris/moisture in the lines, the TX valve can clog or corrode and should be replaced. On the VE, it’s located at the evaporator inlet/outlet where the A/C pipes pass through the firewall into the HVAC case. Access varies by engine/trim, so follow the workshop procedure.

• Always have a licensed ARCtick technician recover the refrigerant before removal.
• Replace all disturbed O-rings with the correct material, lightly lubricated with the specified oil.
• Don’t try to “flush” a TX valve, replace it if contaminated or stuck.
• Replace the receiver–drier or desiccant bag (as applicable to build) whenever the system is opened, especially after a compressor event.
• Pressure-test with dry nitrogen, evacuate to deep vacuum, then charge with the specified mass of R134a and the correct PAG oil per the under‑bonnet label or service manual.

Good preventative habits help the TX valve out: keep the condenser clean, ensure fans run properly, and change the cabin filter so airflow across the evaporator stays healthy. If vent temps wander, there’s hissing at the firewall, or the system cools fine on the move but not at idle, it’s time for a proper A/C diagnosis that includes the TX valve.

Does a 2009 Holden Commodore use a TX valve or an orifice tube?

It uses a TX valve. The VE platform’s A/C design is a thermostatic expansion valve system rather than a fixed orifice tube. That’s documented in the VE HVAC service procedures and parts listings.

Where’s the TX valve on a 2009 Commodore?

It’s mounted at the evaporator connection point where the A/C lines pass through the firewall into the HVAC case. Access can be from the engine bay side and/or just inside the dash area depending on model and tooling, so check the factory procedure before starting.

What are the common signs a TX valve needs attention?

Poor cooling at idle, icing or frost on the small line, big swings in vent temperature, and abnormal high/low gauge pressures are tell‑tales. After a compressor failure, debris often finds its way into the TX valve, so replacement is recommended as part of the repair.