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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Leak Testing




Visual Check

With engine idling, turn steering wheel as far as the stop and hold still. The maximum possible line pressure results in this way.

In this position, check all pipe connections for leaks and retighten if necessary.

Perform the check for a maximum of ten seconds. A longer check should always be interrupted by a brief pause after approximately ten seconds.