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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Heater Core: Service and Repair


1. Disconnect battery ground cable and drain cooling system.
2. Disconnect heater hoses from core and plug openings in core.
3. Remove heater core housing to dash panel attaching screws, then the housing.
4. Remove core from housing.