* Engine Coolant Temperature (ECT) Sensor: This is the most common sensor and provides the engine's computer (PCM) with information about the coolant temperature. This sensor is usually located in the intake manifold, or sometimes directly in the engine block, near the thermostat housing. You'll likely need to consult a repair manual specific to your Silverado's engine (e.g., 4.3L, 3.5L) to pinpoint the exact location.
* Other Temperature Sensors: There might be additional sensors, such as one for the gauge in the instrument cluster (this one provides the temperature reading you see on your dashboard). Its location will also vary by engine.
To find it: A repair manual specific to your 2005 Chevy Silverado's engine is the best resource. Online resources like Haynes or Chilton manuals offer diagrams and location details. You can also find videos on YouTube demonstrating sensor location for your specific engine.
Caution: Be careful when working around the engine, as it can be hot even after it has been turned off.
