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Yes, a faulty coolant temp sensor can do that.
Where is the coolant temp sensor on the 1998 gmc safari awd
It is on the drivers side of the block.
check coolant temp sensor
where it the temp sensor sender located on a 2001 gmc Jimmy
If the check engine light has or is illuminated, check for codes, remember this is an OBD I system. I've seen the coolant temp sensor with two wires for the ECM (not the single wire temp sensor for the temp gauge) do that.
Coolant temp sensors are usually located very close to the thermostat housing, so follow the upper radiator hose to the engine, it will attach to the thermostst housing and you will see the coolant sensor close by.
The coolant level sensor is bad
Coolant Temperature Sensor/Switch (For Computer)Engine, Left Front
on the cylinder head
The 2002 GMC Sierra: temperature sensor is located on the front of the engine. The sensor will be just above the thermostat housing.
water temperature sensor located near steering colum..