Operation CHARM: Car repair manuals for everyone.
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 HVAC: Testing and Inspection

WATER TEMPERATURE SENSOR INSPECTION
1. Remove the water temperature sensor.
2. Measure the temperature around the water temperature sensor.







3. Measure the resistance between terminals A and B of the water temperature sensor connector (male).
- If the resistance is not in the shaded zone indicated in the graph, replace the water temperature sensor.