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.
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HOMESERVICE MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1397 (HVAC CLIMATE CONTROL SYSTEM)DESCRIPTION AND OPERATIONAIR CONDITIONINGA/C CYCLING SWITCH
2009 Mercury Milan Premier, 3.0 1, AWD
A/C Cycling Switch
2009 Mercury Milan Premier, 3.0 1, AWDSECTION A/C Cycling Switch
WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
The A/C cycling switch is mounted on a Schrader valve-type fitting on the top of the suction accumulator.
- The electrical switch contacts open when the suction pressure drops below normal levels. The contacts close when the suction pressure rises. For specifications regarding operating pressure(s), refer to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION & DIAGNOSTICS article.
- When the A/C cycling switch contacts open, the A/C clutch field coil is de-energized and compressor operation stops.
- A valve depressor, located inside the threaded end of the A/C cycling switch, presses in on the Schrader valve stem, allowing the suction pressure inside the suction accumulator to control the operation of the A/C cycling switch.
- It is not necessary to discharge the refrigerant system to remove the A/C cycling switch.
RENDER: 1.0x
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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.