* On the intake manifold: This is the most common location. The sensor is typically screwed into the intake manifold itself, near the thermostat housing. It's often a single-wire sensor.
* In the engine block: Less common on the 3.9L, but possible, especially on older models. This would be a threaded sensor directly in the engine block, often near the thermostat housing as well.
To locate it definitively:
1. Consult your vehicle's repair manual: This is the best resource. It will have diagrams showing the exact location for your specific year and model.
2. Use a repair manual app: Apps like Mitchell 1, AllDataDIY, or others offer detailed diagrams and information. You'll need to enter your vehicle's year, make, and model.
3. Look near the thermostat housing: This is the most likely area, regardless of whether it's on the intake manifold or engine block. Look for a sensor with a single or multiple wires connected to it, often with a connector nearby.
Important Note: Before working on your vehicle's cooling system, allow it to cool down completely to avoid burns from hot coolant. Always use proper safety precautions when working under the hood.
