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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Evaporator Temperature Sensor / Switch: Testing and Inspection

A/C Thermostat Test:




- Dip the A/C thermostat into a pan filled with ice water, and check for continuity between the terminals.

Cut off: 35-31 °F (1 .5--O.5°C)
Cut in: 36-41 °F (2.5-5°C)


- If cut off or cut in temperature is too low or too high, replace the A/C thermostat.