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
If it fails: lemon-manuals.org.ua

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Heater Core Temperature Sensor / Switch: Testing and Inspection

Dip the sensor in ice water, and measure the resistance. Then pour hot water on the sensor, and check for change in resistance.

Compare the resistance reading between the No.1 and No.2 terminals of the heater core temperature sensor with the specifications shown in the graph; the resistance should be within the specifications.