97 chevy lumina are there coolant fan sensors

there is a coolant temperature sensor in the system ( normally in the vicinity of the top radiator hose /thermostat. It activates a relay that switches on the fans--normally around 85 degrees c. Check both fuse and the relay for correct operation. The sensor unit will be squarish with 2 wires in the connector.

All electric..thermostatic switches. When the coolant gets too hot a switch is tripped that fires up the fans. There is a mechanical valve too, it directs hot coolant away from engine.

Make sure your cooling fan is coming on ,if you force the ac on that should make the fan come on after a minute or so if the fan comes on with the ac the problem is either the coolant sensor or the fan motor is going bad

Is the radiator full? make sure there are no air pockets in the engine block. Check the coolant level often.

if the fan has a viscous fan hub replace it
if it has electric fans , check the fuses, relay , coolant temp sensor and fans

It does not have a fan clutch,it has a electric fan,the cooling fan comes on when it gets to a certain temp,the engine that is,and that is about 215 degrees to 219 degrees,and if the ac is turned on,the cooling fans will come on.

You can try replacing the engine coolant temp sensor, it may be off a bit.
Ask your Chevy dealer service writer if there is a service bulletin for a reflash of the engine computer which controls when the fan comes on based on info from the temp sensor.

Make sure the fuse is not blown,or cooling fan relays are not bad.Then check the cooling system to make sure the system is full.If it is low,the coolant sensor will not sense anything,it has to be emerged in coolant to sense.If all this checks out,replace the coolant sensor,for this sensor,is the most likely cause for the problem.

It should have two behind the flywheel.

When it stops, does it have spark? (crank sensor)