Parts for your 2000 Ford Falcon-Tx valve

2000 Ford Falcon TX Valve: What It Does, Where It Lives, and When to Replace It

Yes, the 2000 Ford Falcon (AU Series) does use a TX valve. Ford’s AU Series Workshop Manual (Climate Control, Section 412-03) describes a thermostatic expansion valve fitted at the evaporator inlet with a receiver–drier up front by the condenser. Ford’s Microcat EPC for AU models (1998–2002) lists the A/C expansion valve under base number 19D734 for these vehicles. Aftermarket Australian catalogues from well-known brands also supply a dedicated TX valve for AU Falcons, confirming fitment.

On a 2000 Falcon, the TX valve is the brains of the air-con’s refrigeration circuit. It meters refrigerant into the evaporator based on temperature and pressure, keeping cabin temps comfy while protecting the system from flooding or starving. When it’s doing its job, you get steady vent temps, quick cool-downs, and no frost-ups.

As part of routine servicing, the TX valve isn’t a scheduled replacement item. It’s typically replaced when there are symptoms or when the system’s been opened for major work. Telltales of a crook TX valve include: weak cooling at idle but better at speed, fluctuating vent temperatures, evaporator icing, or high/low side pressures that don’t make sense on the gauges. Contamination (black death, desiccant dust, or metal) can also make a TX valve stick or clog.

• If the system’s opened or a compressor has failed, it’s smart practice to replace the TX valve and the receiver–drier together, renew all O-rings, and flush where appropriate.
• A licensed A/C technician should recover the refrigerant, swap the valve at the firewall/evaporator connection on the passenger side, torque the fittings correctly, evacuate to deep vacuum, and recharge with R134a to the factory spec.
• Oil balance matters: add the correct PAG oil amount for any parts changed.

Owners who notice erratic cooling or frost on the low-pressure line near the firewall should book an A/C performance test. On AU Falcons, access to the TX valve is generally from the engine bay where the two hard lines enter the firewall. Insulation pads or covers may need to be moved, and corroded fittings deserve patience to avoid damaging the evaporator block.

Done properly, a fresh TX valve restores smooth control, protects the compressor, and keeps the Falcon’s cabin chill without overworking the system—perfect for Aussie and Kiwi summers.

Where is the TX valve on a 2000 Ford Falcon?

It’s mounted at the evaporator inlet/outlet block on the passenger-side firewall, where the A/C hard lines pass into the cabin. Access is from the engine bay, a tech will remove the line clamps and insulation to reach the valve body and O-rings.

What symptoms point to a failing TX valve versus low refrigerant?

A failing TX valve often causes fluctuating vent temps, frosting at the evaporator/low-side line, and odd gauge readings (very low evaporator temp or erratic superheat). Low refrigerant more commonly shows as consistently poor cooling with rapid compressor cycling and low suction pressure. A proper gauge check and leak test separates the two quickly.

Should the receiver–drier be replaced with the TX valve?

Yes. Any time the system is opened, the receiver–drier should be renewed to keep moisture and debris out of the new valve and compressor. Many techs treat the TX valve and drier as a pair during major A/C work on AU Falcons.