Parts for your 2007 Ford Fiesta-Tx valve

2007 Ford Fiesta TX valve: what it does and how to look after it

Yes, a 2007 Ford Fiesta uses a thermal expansion valve (TX valve/TXV) in its air‑conditioning system. This isn’t an orifice‑tube setup. Technical references that identify the TXV on the Fiesta Mk6/WP–WQ include: Ford Fiesta 2002–2008 Workshop Manual (Section 412‑00 Climate Control), the Ford service parts catalogues (Microcat/ETIS) listing an A/C expansion valve and seal kit for this model range, and the Haynes Ford Fiesta 2002–2008 manual, which details TXV location and replacement. These sources place the valve at the evaporator inlet on the firewall/bulkhead.

On this Fiesta, the TX valve meters the exact amount of R134a flowing into the evaporator based on temperature and pressure, so the evaporator runs at the sweet spot for cooling without icing up. That means quicker cool‑down on hot arvos, steadier vent temps, and less compressor stress over the long haul.

It’s not really a regular “service item”, but it’s worth checking any time the A/C is being repaired or regassed. Typical clues a Fiesta TXV is playing up include:

• Weak or erratic cooling, especially at idle or after a hot soak
• Evaporator outlet or valve frosting, hissing, or hunting pressures
• High side pressure elevated with a starved low side on the gauges

Replacement is straightforward for a licenced A/C tech: recover the refrigerant, crack the lines at the bulkhead, swap the TXV and O‑rings, evacuate, then charge by weight to the under‑bonnet spec. Always fit new green HNBR seals, add the correct PAG oil quantity and viscosity as per the compressor label, and pressure‑test before vacuum and charge. Because the system’s been opened, best practice is to renew the receiver‑drier (on many Fiestas of this era it’s integrated with the condenser) to keep moisture at bay and protect that fresh valve and the compressor.

Good habits help the TXV live a long, drama‑free life:

1. Run the A/C regularly to circulate oil and keep seals supple.
2. Keep the cabin filter clean so airflow across the evaporator stays healthy.
3. If the compressor or condenser is replaced, flush lines where appropriate and use a calibrated scale to charge the exact refrigerant mass.

One last bit of common sense for Aussie and Kiwi owners: refrigerant handling is a licenced job under ARCtick rules—don’t vent it, and let a pro with the right gear take care of recovery, vacuum, and re‑charge. Done right, a new TXV will restore crisp, reliable cooling to a 2007 Fiesta.

Popular questions about the 2007 Ford Fiesta TX valve

Does a 2007 Ford Fiesta have a TX valve or an orifice tube?
It uses a TX valve mounted at the evaporator on the firewall, not an orifice tube. This layout is documented in the Ford Workshop Manual (Section 412‑00), Ford Microcat/ETIS parts listings for the model, and the Haynes manual for 2002–2008 Fiestas.

What are the signs the TX valve is failing on a Fiesta?
Common symptoms are slow or inconsistent cooling, frost on the valve or evaporator outlet, and gauge readings showing a high high‑side with a starved low‑side. A licenced tech can confirm with pressure testing and temperature drop checks across the valve.

Should the receiver‑drier be replaced when changing the TX valve?
Yes. Whenever the system is opened, replace the receiver‑drier (often built into the condenser on this model). It captures moisture and debris, protecting the new valve and the compressor. Follow up with a deep vacuum and a precise charge by weight.