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.
A/C Switch
The A/C Switch is a momentary contact switch. Toggling the switch results in the A/C-Heater Control Module sending a change of state message to the PCM to provide A/C compressor clutch activation or deactivation respectively. The A/C-Heater Control Module will only provide this request if EVAP function is found acceptable. The Power Switch must be on to make the A/C switch active. The switch status indicator illuminates when the switch is on. The A/C Switch setting is remembered during power down.
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.