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

Without A/C






1 Heater control (temperature) cable
2 Temperature regulator flap servo vacuum hose
3 Temperature regulator flap vacuum servo
- Vacuum applied = temperature regulator flap closed no air flow to heater core.
- No vacuum = temperature regulator flap open, air flow through heater core.
4 Heater control valve
5 Vacuum check valve
6 T-connection (vacuum supply)
7 Vacuum reservior
8 Vacuum hose to temperature, regulator flap vacuum servo
9 Vacuum hose to vacuum supply (T-connection in engine compartment)