Where is the coolant temperature sensor on a 2003 Chevrolet Astro Van?

The coolant temperature sensor (CTS) on a 2003 Chevrolet Astro van is typically located on the engine block, near the thermostat housing. However, there's a *possibility* it could be in the thermostat housing itself. Its exact location can vary slightly depending on the engine (4.3L V6 or 2.9L V6).

To be certain, you should:

1. Consult your owner's manual: This is the best resource for your specific vehicle. It will show a diagram of the engine compartment and identify the sensor.

2. Use a repair manual: A Haynes or Chilton manual for your year and model Astro will have detailed diagrams and instructions.

3. Search online for diagrams: Search for "2003 Chevrolet Astro coolant temperature sensor location" on Google Images or YouTube. Look for images that match your engine.

Without visual confirmation using one of the above methods, I cannot pinpoint the exact location with certainty. Remember to let the engine cool completely before attempting to locate or work on the sensor.