Ford F150 Pickup. Instruction — part 1679

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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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 PAG Refrigerant Compressor Oil (R-134a Systems) or equivalent. 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.

A/C compressor is serviced only as an assembly. The A/C clutch disc and hub
(19D786), A/C clutch pulley (19D874), A/C clutch field coil (19D798), and shaft
seal are serviceable.

NOTE:

Installation of a new suction accumulator is not required when repairing the air
conditioning system except when there is physical evidence of system
contamination from a failed A/C compressor or damage to the suction
accumulator.

2003 Ford Pickup F150

2003 HVAC Air Conditioning - F150 Pickup

Fig. 4: Disassembled View Of Magnetic A/C Clutch
Courtesy of FORD MOTOR CO.

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.

2003 Ford Pickup F150

2003 HVAC Air Conditioning - F150 Pickup

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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 pulley.

A/C Compressor Pressure Relief Valve

An A/C compressor pressure relief valve is incorporated in the compressor A/C manifold and tube (19D734) to:

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relieve unusually high refrigerant system discharge pressure buildups. For specifications regarding
operating pressure(s), refer to CLIMATE CONTROL SYSTEM .

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prevent damage to the A/C compressor and other system components.

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avoid total refrigerant loss by closing after the excessive pressure has been relieved.

A/C Condenser Core

Fig. 5: Locating A/C Condenser Core
Courtesy of FORD MOTOR CO.

NOTE:

Installation of a new suction accumulator/drier is not required when repairing
the air conditioning system except when there is physical evidence of system
contamination from a failed A/C compressor or damage to the suction
accumulator/drier.

2003 Ford Pickup F150

2003 HVAC Air Conditioning - F150 Pickup

The A/C condenser core has the following characteristics:

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It is an aluminum fin and tube design heat exchanger located in front of the vehicle radiator (8005).

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It cools compressed refrigerant gas by allowing air to pass over fins and tubes to extract heat and by
condensing gas to liquid refrigerant as it is cooled.

Refrigerant Lines

The condenser to evaporator tube contains high pressure liquid refrigerant upstream of the A/C evaporator core
orifice.

The A/C manifold and tube is attached to the A/C compressor, is sealed with the O-ring seals and has the
following features:

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The upstream side contains low pressure refrigerant gas.

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The downstream side contains high pressure refrigerant gas.

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An integral non-serviceable muffler and a serviceable high pressure A/C charge port valve are located on
the downstream side.

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The downstream side also contains a fitting used to mount the A/C pressure cutoff switch. A long-travel
Schrader-type valve stem core is installed in the fitting so that the A/C pressure cutoff switch can be
removed without discharging the A/C system.

A/C Evaporator Core

NOTE:

Installation of a new suction accumulator/drier is not required when repairing
the air conditioning system except when there is physical evidence of system
contamination from a failed A/C compressor or damage to the suction
accumulator/drier.

2003 Ford Pickup F150

2003 HVAC Air Conditioning - F150 Pickup