Parts for your 2007 Holden Captiva 5-Tx valve

2007 Holden Captiva 5 TX valve: what it is, where it fits, and when to sort it

Yes, the 2007 Holden Captiva 5 is fitted with a thermal expansion valve (TX valve). This is confirmed by GM Service Information (CG Captiva HVAC section), Autodata A/C system diagrams for the CG series, and ACDelco/GM parts catalogues listing an “A/C Evaporator Expansion Valve” for 2006–2011 Captiva (CG) variants. Those technical sources show the Captiva’s air-con uses a TXV-and-receiver-drier layout rather than an orifice-tube/accumulator design.

On this model, the TX valve meters liquid R134a into the evaporator based on temperature and pressure feedback, maintaining the right superheat so the evaporator stays cold without icing. In everyday speak: it’s the traffic controller for refrigerant flow, keeping cabin temps steady, especially in stop–start city driving and during Kiwi/Aussie summer heatwaves.

The TX valve sits at the evaporator inlet, typically at the firewall/evaporator case interface. Access varies by engine and market, some jobs are done from the engine bay, others need glovebox/under-dash or cowl removal to reach the valve block and lines.

It isn’t a regular “service item”, but it’s worth attention when chasing A/C performance issues or any time the system’s been opened. Telltale signs the Captiva’s TXV may be acting up include:

• Slow or weak cooling, especially at idle or traffic lights
• Evaporator icing or frost on lines near the valve
• Erratic vent temps or a loud hiss at the firewall
• Pressure readings showing a starved or flooded evaporator

When replacing the TX valve on a Captiva 5, use new HNBR O‑rings, observe line cleanliness, and torque fasteners to spec. Best practice is to replace the receiver‑drier at the same time, flush where appropriate, add the correct PAG oil amount for any components changed, evacuate thoroughly, and recharge by mass to the under‑bonnet label. Leak testing with nitrogen and an electronic detector beats guesswork.

Because refrigerant handling is regulated in Australia and New Zealand, the job should be done by a licensed A/C tech with the right recovery, vacuum and charging gear. As part of routine care, change the cabin filter on schedule, run the A/C regularly year‑round to keep seals supple, and inspect for oily residue around the TX valve block that could hint at a slow leak.

Popular questions about 2007 Holden Captiva 5 TX valves

Does the 2007 Captiva 5 use a TX valve or an orifice tube?
It uses a TX valve. GM Service Information for the CG Captiva platform, Autodata HVAC diagrams, and ACDelco parts listings all specify a thermal expansion valve at the evaporator. This setup pairs with a receiver‑drier condenser.

Where is the TX valve located on a Captiva 5?
It’s mounted at the evaporator inlet, typically at the firewall area where the A/C lines pass through. Depending on engine and build, access may be from the engine bay or may need glovebox/under‑dash or cowl removal to reach the valve and line block.

When should the TX valve be replaced?
There’s no fixed interval. Replace it if you have poor cooling, icing, unstable pressures/temps, contamination (“black death”), or any time the system’s been open and there’s doubt about internal cleanliness. Always pair the job with proper evacuation, drier replacement, and a recharge by mass.