Where is the coolant temp sending unit on a 3.4L V6?

The location of the coolant temperature sending unit on a 3.4L V6 engine varies depending on the year, make, and model of the vehicle. There's no single answer. It's usually located on the engine block or the cylinder head, often near the thermostat housing or water pump. However, some vehicles might have it integrated into the thermostat housing itself.

To find it, you'll need to:

1. Consult your vehicle's repair manual: This is the most reliable source. The manual will show you a diagram of the engine and pinpoint the exact location of the sensor.

2. Use an online parts diagram: Websites selling auto parts (like AutoZone, Advance Auto Parts, etc.) often have searchable parts diagrams for your specific year, make, and model. Search for "coolant temperature sensor" or "ECT sensor."

3. Look for a single-wire or two-wire sensor: The coolant temperature sending unit is usually a relatively small sensor with one or two wires connected to it. It's often located near other sensors and hoses associated with the cooling system.

Warning: Be careful when working near hot engine components. Allow the engine to cool completely before attempting to locate or replace the sensor.