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: Testing and Inspection

1. Remove the heater core from the heater unit.
2. Check for cracks, damage, and coolant leakage.
- If any are found, replace the heater core.

3. Check for bent fins.
- If any are bent, use a flathead screwdriver to straighten them.

4. Verify that the heater core inlet and outlet are not distorted or damaged. Repair with pliers if necessary.