Parts for your 2007 Ford Mondeo-Tx valve

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

Based on technical documentation and catalogues, the 2007 Ford Mondeo is fitted with a thermal expansion valve (TX-valve). Ford’s workshop literature (Ford TIS/ETIS, 2007 Mondeo, Climate Control sections 412-00 and 412-03) identifies an evaporator-mounted expansion valve, and Ford’s official parts catalogues (Microcat/ECAT) list a “valve—expansion” for 2007 Mondeo variants. Major aftermarket catalogues (DENSO, Hella-Behr, Sanden) also supply direct-fit TX-valves for 2007–2014 Mondeo models, with typical Ford part references including 6G91-19D734-AB. That means a TX-valve is relevant and used on this vehicle.

The TX-valve meters the flow of R134a into the evaporator, responding to outlet temperature and pressure to keep evaporator superheat in the sweet spot. Done right, it gives stable cabin temps, prevents evaporator icing, and helps the compressor live a long, efficient life. If the valve sticks or drifts out of spec, expect weak cooling at idle but colder on the open road, frosty or sweating lines at the firewall, rapid cycling, or odd pressure readings during a gauge test.

When servicing a Mondeo’s air-con, the TX-valve is worth a check any time performance is down or the system’s been opened. Good practice includes:

• Always recover refrigerant properly, then replace the TX-valve using new O-rings lubricated with the correct PAG oil.
• Replace the receiver-drier (often integrated in the condenser) whenever the system is opened, or after a compressor change.
• Vacuum the system thoroughly to remove moisture, then charge by weight to the under-bonnet label spec.
• If there’s been compressor failure or black death, flush lines and the condenser (or replace the condenser if it can’t be properly cleaned) before fitting a new TX-valve.
• Check the cabin filter—restricted airflow can mimic TX-valve faults.

Techs will also verify superheat and pressure stability after re-gas. A healthy TX-valve shows steady low-side pressure and consistent vent temps without icing. Because the valve sits at the evaporator connection, access can be tight, budgeting for dash-side labour on some variants is sensible. With correct parts and procedures, a fresh TX-valve restores crisp, even cooling—ideal for Aussie and Kiwi summers.

• How can someone tell if their 2007 Mondeo’s TX-valve is failing?
  Common clues are poor cooling at idle but better while cruising, hissing at the firewall, evaporator or outlet tube frosting, and unstable gauge readings. A pro can confirm by measuring superheat and checking that pressures respond smoothly to load and fan speed.
• Should the receiver-drier be replaced when changing the TX-valve?
  Yes. Any time the system is opened, the drier should be renewed to protect the new valve and compressor from moisture and debris. Many Mondeos have the drier integrated with the condenser—so it may mean a condenser swap.
• Does the system need a re-gas after TX-valve replacement?
  Absolutely. After replacing the valve, the system must be evacuated to remove air and moisture, then recharged by weight with the correct R134a and PAG oil per the under-bonnet label.