Question about 1998 Pontiac Sunfire
Ensure you are checking the right sensor.
The coolant level sensor is usually located in the coolant resevoir. It generally performs a hi/lo monitor switch function.
The coolant temperature sensor is usually located on the motor (cylinder head or thereabouts). It is a variable resistor dependant on coolant temperature.
As a quick check to identify the sensor, with engine running, short the sensor to ground. If it's the temp gauge sensor the gauge will go max high. Open circuit connection = temp low.
Posted on Aug 01, 2009
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Posted on Jan 02, 2017
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NOTE Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
Fig. Coolant temperature sensor for the 2.2L Engine
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