Parts for your 2001 Ford Falcon-Temperature sensors

2001 Ford Falcon temperature sensors — purpose, service and replacement

Based on the Ford Australia Falcon AU Series III Workshop Manual (2001–2002), Gregory’s Falcon AU 1998–2002 Repair Manual, and Ford EEC‑V diagnostic literature, the 2001 Ford Falcon is fitted with multiple temperature sensors. These include the engine coolant temperature (ECT) sensor, intake air temperature (IAT) sensor, and, on automatic models, a transmission fluid temperature sensor. Certain trims also use ambient and evaporator sensors for climate control. So yes—temperature sensors are relevant and used on this model.

On a 2001 Falcon, temperature sensors are the quiet achievers that keep the driveline happy. The ECT sensor lets the powertrain control module (PCM) know how hot the engine is so it can sort fuelling, ignition timing, idle speed, thermo‑fan operation, and overheat protection. The IAT sensor helps the PCM adjust for air density changes, which improves start‑up, economy, and throttle response across Aussie and Kiwi weather. Autos rely on a transmission temp input to refine shift timing and line pressure. Depending on build, there may be a separate sender for the dash gauge, or the cluster may receive temperature data via the PCM.

They’re not a scheduled replacement item, but they do benefit from sensible servicing habits. Under the bonnet, clean electrical plugs and sound wiring are vital—green crust on terminals or broken locking tabs can throw the readings out. Keeping the cooling system fresh stops scale and sludge from insulating the sensor’s tip. Always run the correct coolant mix specified by Ford and avoid straight water.

• Typical faults: hard cold starts, rich running, poor economy, fans stuck on, erratic gauge, or fault codes such as P0115–P0119.
• Simple checks: compare live data on a scan tool to ambient when cold, after warm‑up, confirm steady readings and proper fan cut‑in.

When replacement’s due, let the engine go stone cold. Relieve system pressure, drain a little coolant below sensor level, disconnect the plug, and unscrew the sensor with a deep socket. Catch spills, fit the new unit with the supplied seal (avoid PTFE tape unless the workshop manual specifies it), and tighten to the factory torque. Refill, then bleed the cooling system—heater on hot, run until the thermostat opens, top up, cap it, and recheck the overflow after a short drive. Clear any stored codes and confirm the readings look sensible on the scan tool.

A few preventative touches go a long way: secure the harness away from hot surfaces, keep connectors dry, and service the cooling system on time. That way, the Falcon’s temperature sensors can get on with the job without fuss, kilometre after kilometre.

Popular questions about 2001 Ford Falcon temperature sensors

Where is the coolant temperature sensor on a 2001 Ford Falcon (AU III)?
On the inline‑six, it’s typically screwed into the thermostat housing at the front of the engine. On the 5.0‑litre V8, look near the coolant crossover by the thermostat area on the intake manifold. Some cars also have a separate sender for the dash gauge nearby.

Can an AU Falcon have two coolant temperature senders?
Yes. Depending on build and cluster spec, one sensor feeds the PCM while another simple sender drives the dash gauge. Other cars route the gauge from the PCM’s data. If you’re chasing an issue, identify which unit your wiring uses before replacing parts.

Do I need to bleed the cooling system after replacing the ECT sensor?
Absolutely. Any air trapped around the sensor tip can skew readings and cause odd fan behaviour. Top up, run the engine with the heater on hot until the thermostat opens, top up again, fit the cap, then recheck the level after it cools. Watch for leaks at the sensor.