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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Temperature Control

With the ignition switch in the RUN position, voltage is applied through the HVAC CTL fuse (CKT 41) and the DIC/HVAC fuse (CKT 541) to the Heater-A/C Control. The voltage from CKT 733 (LT BLU) is varied from the battery to approximately 1.5 V by the temperature control potentiometer. The control assembly provides a ground path through CKT 150 (BLK).