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.
2008 Ford Mustang V8-5.4L SCFACTORY OEM SERVICE PROCEDURE
General Specifications
Item Specification
A/C Compressor
Type FS-18
Rotation Clockwise
A/C Compressor Magnetic Clutch
Air gap clearance 0.35-0.65 mm (0.014-0.026 in)
A/C Cycling Switch Open and Closed Pressures(a)
Open pressure 145-159 kPa (21-23 psi)
Closed pressure 290 kPa (42 psi)
A/C Pressure Relief Valve(a)
Open pressures 3,792-4,137 kPa (550-600 psi)
A/C Pressure Transducer (V6) Computers and Control Systems.
Evaporator Core Orifice
Color Blue
Dual Function Pressure Switch (V8)(a)
Clutch off/open 2,999-3,275 kPa (435-475 psi)
Clutch on/closed 1,517-1,931 kPa (220-280 psi)
Fan on/open 2,137-2,344 kPa (310-340 psi)
Fan off/closed 1,655-2,137 kPa (240-310 psi)
(a)Manifold gauge set pressures may vary slightly depending on the distance between the service gauge port valve and the A/C pressure relief valve, the A/C cycling switch, the A/C pressure transducer (V6) and the dual function pressure switch (V8) location.
A/C Compressor
Type FS-18
Rotation Clockwise
A/C Compressor Magnetic Clutch
Air gap clearance 0.35-0.65 mm (0.014-0.026 in)
A/C Cycling Switch Open and Closed Pressures(a)
Open pressure 145-159 kPa (21-23 psi)
Closed pressure 290 kPa (42 psi)
A/C Pressure Relief Valve(a)
Open pressures 3,792-4,137 kPa (550-600 psi)
A/C Pressure Transducer (V6) Computers and Control Systems.
Evaporator Core Orifice
Color Blue
Dual Function Pressure Switch (V8)(a)
Clutch off/open 2,999-3,275 kPa (435-475 psi)
Clutch on/closed 1,517-1,931 kPa (220-280 psi)
Fan on/open 2,137-2,344 kPa (310-340 psi)
Fan off/closed 1,655-2,137 kPa (240-310 psi)
(a)Manifold gauge set pressures may vary slightly depending on the distance between the service gauge port valve and the A/C pressure relief valve, the A/C cycling switch, the A/C pressure transducer (V6) and the dual function pressure switch (V8) location.
Factory Service Tools
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.