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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R12 and R134A Refrigerants Are Not Interchangeable

R12 and R134a Refrigerants Are Not Interchangeable and Cannot Be Mixed!

Mixing different refrigerants during service will result in a significant pressure increase in the vehicle A/C system and in your recovery equipment. Recovery of even small amounts of R12 or any substitute refrigerant in your R134a service equipment can result in the following A/C service concerns:

^ Contamination of previously recovered refrigerant.

^ Increased repair costs and down time to R134a recovery/recycling equipment.

^ Longer recovery time and/or recovery equipment shutting off prior to complete recovery.

^ Refrigerant loss as contaminated refrigerant will activate automatic air purge system.

^ Spread of contaminated refrigerant to other vehicles.

^ Dissatisfied customers and comebacks for concerns of insufficient cooling, compressor noise, system leaks, durability and other conditions resulting from higher system pressures.