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

Leak Test - Service Ports/Access Valves

The primary seal for the service ports is the sealing cap. This cap contains a specially designed O-ring or gasket which provides a leak-free seal. Should the cap be loose, missing, or the wrong cap used, it will result in the loss of refrigerant.