Ford 2003 Mustang Workshop Manual page 3176

A one-piece lip-type seal (installed from the front of the A/C compressor) is used to seal it at the
shaft opening in the assembly.
Five double-acting pistons operate within the cylinder assembly. The pistons are actuated by a
swashplate that converts the rotating action of the shaft to a reciprocating force.
Reed-type discharge valves are located between the cylinder assembly and the head at each
end of the A/C compressor.
The A/C compressor uses PAG oil, or equivalent. This oil contains special additives required for
the A/C compressor.
The A/C compressor oil from vehicles equipped with an FS-10 A/C compressor may have some
dark colored streaking while maintaining a normal oil viscosity. This is normal for the A/C
compressor and is caused by break-in wear of the piston rings.
Item Part Number
1 19D798
2 19D784
3 N805338-S2
4 19D648
5 19D786
6 N805332-S2
The magnetic A/C clutch has the following characteristics:
It drives the compressor shaft.
When the battery positive voltage (B+) is applied to the A/C clutch field coil, the clutch plate and
hub assembly is drawn toward the A/C clutch pulley.
The magnetic force locks the clutch plate and hub assembly and the A/C clutch pulley together
as one unit, causing the compressor shaft to rotate.
When (B+) is removed from the A/C clutch field coil, springs in the clutch plate and hub
assembly move the clutch plate away from the A/C clutch pulley.
A/C Compressor Pressure Relief Valve
Description
A/C clutch field coil
A/C clutch pulley
Pulley snap ring
A/C clutch hub spacer
Disk and hub assembly
A/C clutch bolt