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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Compressor HVAC: Testing and Inspection


Compressor Oil Check

On models that only use the air conditioning system seasonally, oil level should be checked at the beginning of each season. On models that use air conditioning all year round, check oil at intervals of 30,000 miles or once a year. System oil capacity should be 3.35 fl. oz.