Neon L4-2.0L VIN C (1998)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Fig. 18 Engine Coolant Temperature Sensor
PURPOSE
The combination coolant temperature sensor has two elements.
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One element supplies coolant temperature signal to the PCM.
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The other element supplies coolant temperature signal to the instrument panel gauge cluster.
The PCM determines engine coolant temperature from the coolant temperature sensor.
OPERATION
As coolant temperature varies the coolant temperature sensors resistance changes resulting in a different input voltage to the PCM and the
instrument panel gauge cluster.
When the engine is cold, the PCM will provide slightly richer air-fuel mixtures and higher idle speeds until normal operating temperatures are
reached.
The coolant sensor threads into the rear of the cylinder head, next to the camshaft position sensor (Fig. 10).
New sensors have sealant applied to the threads.
