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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Computer Controller


The ATC control computer manages all of the systems electronic functions. It provides power to operate the power/vacuum module (PVM) electronics and blend-air door actuator. It remembers the operators control panel selected settings when the vehicle is not running and measures return input from the temperature sensors. After measuring all input information, the computer will ground the output circuits to provide logic signals for automatic system control. The computer control panel is not serviceable except for the mode, blower speed, temperature, A/C and off button illumination bulbs.