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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Heater Core: Testing and Inspection




HEATER CORE INSPECTION

1. Inspect the heater core for damage, cracks, and water leakage.

- If there is any malfunction, replace the heater core.

2. Visually inspect the fins for bending.

- If there is any bending, use the end of a flathead screwdriver to straighten the fins.

3. Visually inspect the heater hose for deformation.

- Repair with pliers if there is deformation. If there is any malfunction, replace the heater core.