Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Coolant Temperature Sensor/Switch (For Computer): Description and Operation

The Coolant Temperature Sensor is threaded into the intake manifold just below the thermostat. The temperature sensor converts the engines coolant temperature into an electrical voltage signal. As the temperature increases the voltage return signals will also increase. The Control Unit monitors this returning signal to provide the proper air/fuel ratio and ignition timing.