Where is the temperature sending unit located on a 1998 Chevy s10 4.3L engine?

The temperature sending unit on a 1998 Chevy S10 with a 4.3L engine is typically located on the cylinder head, near the thermostat housing. It's a small sensor, often with one or two wires connected to it. However, there might be *two* temperature sensors: one for the gauge and one for the computer (ECM).

To be certain:

1. Consult your repair manual: A Haynes or Chilton manual for your specific year and model will have a diagram showing the exact location. This is the best approach.

2. Look near the thermostat housing: Start by looking at the thermostat housing on the engine. The temperature sender is usually very close by. It might be on the head itself, or mounted on a nearby fitting.

3. Trace the wires: If you can find the wire(s) going to the temperature gauge or the engine control module (ECM), you can follow them back to the sender.

Be careful when working near hot engine components. Let the engine cool completely before attempting to locate the sensor.