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 Cycling Switch
Air Conditioning (A/C) cycling switch may be wired to either the ACCS or ACPSW PCM input. When A/C cycling switch opens, PCM will turn off A/C clutch. A/C Cycling Switch (ACCS) circuit to PCM provides a voltage signal which indicates when A/C is requested. When A/C demand switch is turned on, and both A/C cycling switch and high pressure contacts of A/C high pressure switch (if equipped and in circuit) are closed, voltage is supplied to ACCS circuit at PCM. See appropriate wiring diagram in WIRING DIAGRAMS article. If ACCS signal is not received by PCM, PCM circuit will not allow A/C to operate. For additional information, see WIDE OPEN THROTTLE A/C CUT-OFF RELAY under PCM OUTPUTS.
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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.