Navigator 4WD V8-5.4L SOHC VIN L (1998)
Compressor Clutch: Description and Operation
A/C compressor and Clutch Assembly
NOTE:
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Internal A/C compressor components are not serviced separately. The FS-10 A/C compressor is serviced only as an assembly. The A/C clutch,
A/C clutch pulley, A/C clutch field coil and the shaft seal are serviceable.
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Whenever the A/C compressor is replaced, also replace the suction accumulator/drier and the A/C evaporator core orifice.
The FS-10 A/C compressor has the following characteristics:
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A ten-cylinder swashplate design utilizing the tangential design mount.
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Displacement of 154 cc (9.4 cubic inch).
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A one-piece lip-type seal (replaceable from the front of the A/C compressor) is used to seal it at the shaft opening in the assembly.
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Five double-acting pistons operate within the cylinder assembly. The pistons are actuated by a swashplate that changes the rotating action of the
shaft to a reciprocating force.
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Reed-type discharge valves are located between the cylinder assembly and the head at each end of the A/C compressor.
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The A/C compressor uses Motorcraft YN-12b refrigerant oil F2AZ-19577-AB or equivalent meeting Ford specification WSH-M1C231-B. This oil
contains special additives required for the A/C compressor.
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The A/C compressor oil from vehicles equipped with an FS-10 A/C compressor may have a dark color while maintaining a normal oil viscosity.
This is normal for this A/C compressor because carbon from the piston rings will discolor the oil.
Compressor Clutch Components
The magnetic A/C clutch has the following characteristics:
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It drives the compressor shaft.
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When battery positive voltage (B+) is applied to the A/C clutch field coil, the clutch disc and hub assembly is drawn toward the A/C clutch pulley.
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The magnetic force locks the clutch disc and hub assembly and the A/C clutch pulley together as one unit, causing the compressor shaft to rotate.
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When B+ is removed from the A/C clutch field coil, springs in the clutch disc and hub assembly move the clutch plate away from the A/C clutch
