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

Automatic Climate Control






The operational test sequence (see chart) will aid in determining whether the HVAC system electrical, air distribution, vacuum or refrigeration systems are functioning properly. The outside air temperature should be above 4°C (40°F); the engine should be warmed to normal operating temperature.