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, then drain cooling system.
2. Remove crash pad and instrument panel frame.
3. Disconnect defroster hose, then set heater control lever to DEF position and disconnect DEF wire.
4. Set heater control lever to HOT position and disconnect HOT wire.
5. Disconnect heater hose at engine, then remove heater core.
6. Reverse procedure to install.