Where is the temperature sensor on 4.3 liter engine of a 2005 Silverado. The that controls temp gauge?

The temperature sensor that controls the temperature gauge on a 2005 Silverado 4.3L engine (a Vortec 4300) is located in the cylinder head. It's usually a single-wire sensor screwed directly into the cylinder head. However, pinpointing the *exact* location without a repair manual or a detailed diagram specific to your vehicle's year and engine is difficult.

To find it, you'll likely need to:

1. Consult a repair manual: A Haynes or Chilton manual for your specific vehicle will have diagrams showing the location of all sensors. This is the most reliable method.

2. Use an online parts diagram: Many auto parts websites (like AutoZone, Advance Auto Parts, etc.) allow you to look up parts diagrams for your vehicle. Look for diagrams showing the engine and locate the coolant temperature sensor (CTS).

3. Visually inspect the cylinder head: With the engine cool, carefully inspect the cylinder head. Look for a sensor with a single wire connected to it, typically located near the thermostat housing or in a similar area where coolant flow is high. Be cautious; some components get hot even after the engine has cooled down.

Important Note: There might be *multiple* temperature sensors on the engine. The one for the gauge is usually different from the one used for the engine control module (ECM) which is involved in fuel management. Make sure you're identifying the correct sensor. If you're unsure, consult a professional mechanic.