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

Radiator Cap

Main Valve Opening Pressure 81.4 - 107.8 kPa (11.80 - 15.64 psi)
Main Valve Closing Pressure 68.6 kPa (9.95 psi)
Vacuum Valve Opening Pressure -686 kPa (-1.00 psi)