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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Servicing R134A Retrofitted Vehicle Systems

Servicing R134a Retrofitted Vehicle Systems

Vehicles retrofitted from R12 to R134a use conversion fittings on the high and low side R12 service ports which allow connection to your R134a recovery equipment. When servicing a previously retrofitted vehicle, there is concern that if all of the R12 was not removed during the retrofit procedure, your R134a equipment and recovery tank will become contaminated.