* On the intake manifold: This is the *more common* location. It's usually on the passenger side (right side) of the engine, embedded in the intake manifold near the thermostat housing. It's a relatively small sensor, often with a single-wire connector.
* In the cylinder head: Less common, but still possible. If it's not on the intake manifold, look directly on the cylinder head itself, again near the thermostat housing.
To find it definitively:
1. Consult your vehicle's repair manual: This is the best source for the exact location. The manual will have diagrams and clear instructions.
2. Look at online diagrams: Search for "2001 Dodge Ram 1500 5.9L coolant temperature sensor location" on sites like AutoZone, Advance Auto Parts, or similar. They often have diagrams you can refer to.
3. Visually inspect your engine: Once you've got a general idea from the manual or online diagrams, carefully examine the area near the thermostat housing on both the intake manifold and the cylinder head. Look for a sensor that resembles a small, threaded device with a wire harness. Be cautious near hot components.
Important Note: Before attempting any work on your engine, let it cool completely. Hot coolant can cause serious burns.
