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 MANUALSFORD2007FUSION SEL, 2.3 Z, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 794 (CLIMATE CONTROL - F250-F550)DESCRIPTION AND OPERATIONAIR CONDITIONINGDUAL FUNCTION PRESSURE SWITCH - 6.0L DIESEL
2007 Ford Fusion SEL, 2.3 Z, Standard
Dual Function Pressure Switch - 6.0L Diesel
2007 Ford Fusion SEL, 2.3 Z, StandardSECTION Dual Function Pressure Switch - 6.0L Diesel
WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The dual function pressure switch (DFPS) 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 valve-type fitting on the high pressure side of the compressor manifold and tube assembly.
- A valve depressor, located inside the threaded end of the DFPS, presses on the Schrader valve stem.
- This allows the DFPS to monitor the compressor discharge pressure.
- The DFPS has 2 sets of electrical contacts. One set of contacts is normally closed and is used for A/C high-pressure cutoff.
- When the A/C compressor discharge pressure rises, the switch contacts open, disengaging the A/C compressor. When the compressor discharge pressure drops, the switch contacts return to the CLOSED position and A/C compressor operation resumes. For specifications regarding operating pressures, refer to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS article.
- The second set of electrical contacts in the DFPS is used for engine cooling fan control.
- It is not necessary to recover the refrigerant to remove the DFPS.
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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.