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!

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Manual Climate Control

Function Selector Switch
The function selector switch combines a vacuum selector valve with two electrical switches to supply battery voltage (B+) to the A/C clutch circuit and the blower motor speed control circuit.

Temperature Control Switch
Temperature selection is accomplished with a potentiometer connected to the electric blend door. Movement of the temperature control switch from COOL (blue) to WARM (Red) causes a corresponding movement on the air temperature that the air system will maintain.