Parts for your 2007 Ford Focus-Tx valve

2007 Ford Focus TX valve: what’s fitted and what to do about it

Referencing technical sources, the AU/NZ‑spec 2007 Ford Focus (C307/LS‑LT) is built with a thermal expansion valve (TX valve) rather than a fixed orifice tube. Ford’s Workshop Manual for the C307 platform (Section 412‑03 Air Conditioning) details removal/installation of an A/C expansion valve at the evaporator, and the Ford Electronic Parts Catalogue lists a TX valve (“valve—A/C expansion”) with associated O‑rings at the bulkhead. Ford service training materials covering variable‑displacement compressors also pair these systems with TX valves. By contrast, the North American 2007 Focus (C170) uses a fixed orifice tube/accumulator (CCOT) system. For owners in Australia or New Zealand, the vehicle in question uses a TX valve.

On the 2007 Focus sold in Australia and New Zealand, the TX valve meters refrigerant into the evaporator based on temperature and pressure, keeping evaporator superheat in the sweet spot. That clever control helps deliver colder vents at idle, steadier cabin temps in stop‑start traffic, and better compressor efficiency on long runs. It’s a small part, but it makes a big difference to comfort and fuel use.

There’s no fixed replacement interval for a TX valve. It’s normally “fit and forget” until symptoms crop up. Tell‑tales include erratic vent temperatures, frosting at the evaporator inlet, compressor short‑cycling, or poor cooling after a recent compressor or condenser replacement. Contamination (metallic debris from a failing compressor) can stick the valve, so if the system’s been open or the compressor has let go, the TX valve and receiver‑drier should be replaced and the lines flushed by a licensed A/C tech.

Replacement is straightforward for a pro: legally recover the R‑134a, disconnect the two A/C pipes at the bulkhead, swap the valve and O‑rings (lightly oil with the correct PAG), then evacuate and recharge to spec. It’s smart practice to fit a new receiver‑drier whenever the system’s opened, run a proper vacuum (30+ minutes on a warm day), and verify pressures and vent temps on completion. Because access can be tight around the firewall, having the right line tools, torque specs, and leak‑test gear avoids repeat visits.

For owners, the best “maintenance” is prevention: keep the condenser fins clear, repair stone damage promptly, and don’t ignore gradual cooling loss—low charge leads to moisture ingress and valve icing. If the Focus has had an A/C component failure, ask the workshop to include the TX valve and drier in the repair plan. It saves headaches and keeps the cabin chilly through an Aussie summer or a muggy Kiwi afternoon.

• Typical signs of TX valve trouble: fluctuating vent temps, frosting at the bulkhead lines, uneven left/right outlet temps, or noisy hissing near the firewall.
• Best tackled by a licensed A/C technician due to refrigerant handling laws and the need for proper evacuation and charging.

Technical sources referenced: Ford Workshop Manual (C307/LS‑LT) Section 412‑03 Air Conditioning – Expansion Valve procedures, Ford Electronic Parts Catalogue for 2005–2008 Focus C307 listing the A/C expansion valve and O‑rings, Ford service training on variable‑displacement compressors and TX‑valve systems.

FAQs

Does a 2007 Ford Focus have a TX valve?
For Australia and New Zealand models (C307/LS‑LT), yes—there’s a TX valve at the evaporator bulkhead. The North American 2007 Focus (C170) instead uses a fixed orifice tube and accumulator.

Where is the TX valve on a 2007 Focus?
It’s mounted at the evaporator connections on the bulkhead where the two A/C pipes pass into the cabin. Access is from the engine bay, the valve sits between those pipes and the evaporator core.

When should the TX valve be replaced?
Only when faulty or the system is contaminated/open. Common triggers are compressor failure, debris in the lines, persistent icing, or unstable vent temperatures despite a correct refrigerant charge.