Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
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Coolant Temperature Sensor/Switch (For Computer): Description and Operation
The coolant temperature sensor, mounted near the thermostat housing, monitors coolant temperature and provides engine operating temperature data to the SMEC or SBEC. The sensor, which is a variable resistor, is also used to turn on the radiator fan.