Where is the coolant temperature sensor located on a 1994 Chevy Astro Van?

The coolant temperature sensor (CTS) on a 1994 Chevy Astro van is typically located on the intake manifold, near the thermostat housing. However, there's a critical distinction: The 1994 Astro likely has *two* coolant temperature sensors. One is for the gauge, and the other is for the engine control module (ECM).

To find them:

* For the gauge: This sensor is usually simpler and more accessible. It often sits on the cylinder head or intake manifold, sometimes near the thermostat housing. Look for a single-wire sensor.

* For the ECM: This is the more crucial one for engine operation. It’s usually also on the intake manifold or cylinder head, often near the thermostat housing but might be slightly further away than the gauge sensor. This one will have multiple wires connecting to it.

To be absolutely certain:

1. Consult a repair manual specific to your 1994 Chevy Astro van's engine: This is the best way to get the exact location, as variations exist based on the engine type (4.3L V6 or other). A Haynes or Chilton manual will be helpful.

2. Look at a wiring diagram: This will show you which sensor has multiple wires and goes to the ECM.

Without knowing the exact engine, I cannot pinpoint the exact location. However, the area described above is the most likely place to find both sensors. Remember safety first; let the engine cool down completely before working near it.