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.
Air Conditioning (A/C) Full Demand Switch
The A/C full demand switch circuit provides a voltage signal to the PCM which indicates the MAX A/C, DEFROST, or FLOOR/DEFROST mode is requested. If the engine is shut down during normal engine operation the PCM restarts it when A/C full demand is selected. The engine will remain running when the A/C full demand switch is selected allowing the A/C compressor to circulate the refrigerant for the passenger compartment.
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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.