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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Heating System Troubleshooting - Manual Type

Fig. 25 Heater diagnosis chart:





When diagnosing heater operation, refer to Fig. 25.




NOTE: Components described are those found in both Manual A/C and Automatic Temperature Control systems. Refer to "Automatic Temperature Control" for diagnosis and testing of components unique to that system.