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

Chevrolet:




Pontiac:






Temperature Control

The temperature control is mechanically linked to the air temperature valve (door) by a temperature control cable. Rotating the temperature control clockwise allows more of the incoming or re-circulated air to flow through the heater core, thus increasing the air temperature entering the vehicle. Rotating the temperature control counterclockwise decreases air flow through the heater core, thus decreasing the air temperature entering the vehicle.