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 MANUALSFORD2007FOCUS SES, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSCLIMATE CONTROLDESCRIPTION AND OPERATIONAIR CONDITIONINGDUAL FUNCTION PRESSURE SWITCH
2007 Ford Focus SES, 4D Sedan, Standard
Dual Function Pressure Switch
2007 Ford Focus SES, 4D Sedan, StandardSECTION Dual Function Pressure Switch
The dual function pressure switch is used to interrupt A/C compressor operation in the event of high system discharge pressures.
- The dual function pressure switch is mounted on a Schrader-type valve fitting on the condenser-to-evaporator tube.
- A valve depressor, located inside the threaded end of the dual function pressure switch, presses on the Schrader valve stem.
- This allows the dual function pressure switch to monitor the compressor discharge pressure.
- It is not necessary to recover the refrigerant to remove the dual function pressure switch.
- The dual function pressure switch has 2 sets of contacts. One electrical contact is normally closed.
- When the compressor discharge pressure rises, the switch contacts open, interrupting the 12 volt A/C request (ACCS) signal to the PCM and disengaging the A/C compressor. When the pressure drops, the contacts close, completing the 12 volt A/C request (ACCS) signal to the PCM and enabling the A/C compressor.
The switch contains a second set of electrical contacts used for high-speed fan control.
- When the compressor discharge pressure rises, the contacts close and send a 12 volt signal (ACPSW) to the PCM requesting high speed cooling fan operation. When the pressure drops, the contacts open and the 12 volt signal is interrupted.
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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.