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)

Or, hide this message: temporarily or permanently

Air Conditioning Switch: Testing and Inspection


1. Disconnect battery ground cable.
2. Disconnect 3-pole connector of A/C switch, connect ohmmeter to switch terminals R and E, with switch in "OFF" position check for continuity.
3. With control in "ON" position, check for continuity between terminals B, R, and E.
4. Replace switch if defective.