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The engine coolant temp (ECT) sensor on that 97 S10 2.2L would be found close to the thermostat.
The coolant temp sensor on a 2003 Chevy S10 V6 is located on the front of the intake manifold. To replace simply unscrew the old sensor and screw on the new one.
Next to the thermostat housing.
Replace the engine coolant temp sensor.
That would be the engine coolant temp sensor for the dash gauge only. The sensor near the thermostat housing is the engine temp sensor for the ECM.
Try replacing the engine coolant temp sensor.
Replace the coolant temp sensor next to the thermostat housing.
On the 4.3L it is located next to the thermostat housing. The electrical plug to it has two wires.
Drivers side of engine, between the #3 and #5 spark plug.
Didn't have an air temp sensor in 92. Came out in 93.
Temp sensor for the gauge.
On the side of the drivers side cylinder head, between #1 and #3 spark plugs.