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

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Thermal Vacuum Valve - EVAP: Testing and Inspection




1. Disconnect vacuum lines from water thermo valve.
2. Start engine and run at 1500 RPM. Ensure air is not drawn into disconnected vacuum lines.
3. Run engine until normal operating temperature is reached, then recheck for vacuum at 1500 RPM. Vacuum should now be present
4. Replace valve if operation is not as described.