Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
System Controls & Operation - All Models (Except CHEVROLET & 125" W.B. Station Wagon): Notes
System control is obtained by two levers (thumbwheels on Corvette) and a four speed blower fan switch. The upper lever (left thumbwheel on Corvette) makes use of vacuum and electrical switches to operate various doors, the compressor, and the blower at "low" in A/C mode. The lower lever (right thumbwheel on Corvette) uses a bowden cable to operate the temperature door in the selector duct assembly.
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.