Parts for your 2000 Ford Falcon-Temperature sensors

2000 Ford Falcon temperature sensors — purpose, care, and when to replace

Based on Ford AU Series workshop literature (EEC‑V engine management) and well-known service manuals for AU Falcon (1998–2002), the 2000 Ford Falcon is fitted with multiple temperature sensors. Chief among these is the engine coolant temperature (ECT) sensor feeding the PCM, plus an intake air temperature (IAT) sensor. Many Falcons of this era also use a separate sender for the dash gauge. These sensors are essential to fuel, spark, idle, and cooling fan strategy, so they’re absolutely relevant on a 2000 Falcon.

On this model, the ECT typically sits in or near the thermostat housing under the bonnet, reading coolant temp and telling the PCM exactly how warm the engine is. Cold starts, warm-up enrichment, radiator fan operation, transmission shift strategy (on some variants), and even AC performance cues all hinge on accurate temperature data. The IAT sensor helps trim fuelling as the air density changes with temperature, keeping the big six or V8 running crisp whether it’s a frosty morning or a scorching arvo.

For servicing, it’s smart to treat temperature sensors as part of the cooling system’s health check. If the Falcon is showing a lazy temp gauge, rough cold starts, black fuelly exhaust, poor economy, or the radiator fans running when they shouldn’t, a tired ECT or wiring fault could be the culprit. Likewise, an IAT that reads hot all the time can make the car feel doughy.

• Inspect connectors and looms for brittleness, oil soak, or green corrosion.
• Scan live data to compare sensor readings against actual engine temp and ambient conditions.
• Test resistance of the sensor against workshop specs, replace if out of range or erratic.
• When replacing, use a quality sensor, refresh the sealing washer/O‑ring, and top up/bleed coolant properly.

There’s no strict replacement interval, but many techs see ECTs drift after 150–200,000 km. If the thermostat housing is being serviced or the cooling system is due for a major, it’s an opportune time to fit a new sensor. Avoid over‑tightening, torque to the workshop spec, and don’t drown threads in tape or sealant unless specified. Keeping coolant fresh and the system bled helps sensors read accurately and keeps the Falcon happy on long Kiwi and Aussie drives.

Popular questions

Where is the coolant temperature sensor on a 2000 Ford Falcon?
On most AU‑series Falcons it’s threaded into or near the thermostat housing at the front/top of the engine. It’s accessible under the bonnet once the intake ducting is out of the way. Some models also have a separate sender for the dash gauge in the same area.

What are the symptoms of a bad temperature sensor?
Cold start flare or stumble, rich running, poor fuel economy, hard hot restarts, fans running at odd times, or a gauge that doesn’t make sense are common flags. A scan tool will often show an implausible coolant or intake temp compared with the actual engine or ambient temperature.

Does the 2000 Falcon use separate sensors for the gauge and the ECU?
Many AU Falcons use an ECT for the PCM and a separate single‑wire sender for the cluster gauge. Depending on build and series, the cluster may also be driven by PCM data. Checking the vehicle’s wiring diagram in AU‑series service information will confirm the exact setup.