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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Heated Glass Element Switch: Testing and Inspection

For instructions on how to use the DRB III scan tool or the a/c heater control self-diagnostics to test the control, (Refer to HEATING & AIR CONDITIONING - DIAGNOSIS AND TESTING - SELF DIAGNOSTICS). The problem is not with the a/c heater control if no trouble codes are found. The next step should be to check the rest of the system after the MTC or ATC head is checked.