Parts for your 2004 Ford Fiesta-Tx valve

2004 Ford Fiesta TX Valve – What It Does and When to Service It

Based on technical references including the Ford Workshop Manual for Fiesta 2002–2008 (section 412-00 Climate Control), the Ford electronic parts catalogue used by dealers, and the Haynes Ford Fiesta Petrol & Diesel 2002–2008 manual, the 2004 Ford Fiesta’s air-conditioning system is fitted with a thermostatic expansion valve (often called a TX valve or TXV). It’s mounted at the evaporator block on the firewall/bulkhead where the two A/C lines enter the cabin, typically as an H‑block style valve.

The TX valve’s job is to meter liquid refrigerant into the evaporator and keep the evaporator at the sweet spot of superheat. That prevents liquid refrigerant from flooding back to the compressor, protects the system, and keeps cabin temps steady even when the car’s idling at the lights or zipping down the motorway. On a Fiesta, a healthy TXV helps deliver quick pull‑down, consistent vent temps, and lower compressor cycling so the system runs efficiently.

• Common signs the TX valve is acting up: weak cooling at idle but better on the move, frost or sweating on one line at the firewall, rapid compressor cycling, uneven vent temps, or unusual high/low gauge pressures during diagnosis.

The TX valve isn’t a routine service item, but it’s wise to consider replacement if the system’s been contaminated (compressor failure, moisture ingress), if there’s evidence of a sticking or blocked valve, or any time the system is opened for major A/C repairs. Always replace the O‑rings, use the correct PAG oil, and follow the Ford torque specs.

1. Recover the refrigerant (must be done by a licensed A/C technician, ARCtick in Australia applies).
2. Disconnect the two A/C lines at the firewall and remove the H‑block TX valve.
3. Install the new valve with new O‑rings, lubricated with compatible oil.
4. Evacuate (vacuum) the system to remove air and moisture, then recharge to the specified mass.
5. Leak‑test and verify vent temps and pressure readings.

To keep the Fiesta’s A/C happy: change the cabin filter on schedule, keep the condenser clean of bugs and debris, and have the system checked if cooling drops off. Regassing without fixing a sticky TX valve is a short‑term band‑aid—proper diagnosis with gauges and temperature readings is the go.

Where is the TX valve on a 2004 Ford Fiesta?

It’s an H‑block valve fitted at the evaporator connections on the firewall/bulkhead, where the two A/C pipes enter the cabin. Access is from the engine bay, the valve sits between the pipe block and the evaporator inlet/outlet.

Does the 2004 Fiesta use an orifice tube instead of a TX valve?

No. Technical references for the 2002–2008 Fiesta platform show a thermostatic expansion valve at the evaporator, not a fixed orifice tube/accumulator setup. That matches the way the system controls superheat and stabilises vent temperatures.

How long does TX valve replacement take and what might it cost?

Allow roughly 1–2 hours plus refrigerant recovery, vacuum, and recharge time. Cost varies by workshop and region, but expect parts (valve and O‑rings) plus labour and a regas. Any contamination or extra faults (e.g., leaking hoses) can add to the bill.