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 cup 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.