Climate Control System: Overhaul Lincoln Aviator I

A/C Compressor and Clutch Assembly

Note. Internal A/C compressor components are not serviced separately. The SC115 A/C compressor is serviced only as an assembly. The clutch plate (19D786), clutch pulley and bearing (19D784), and clutch field coil (19D798) are serviceable.

Note. Installation of a new receiver/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 receiver/drier.

Note. Vehicles equipped with Visteon fixed scroll A/C compressors may experience rapid refrigerant high side pressure fluctuations upon cold startups and/or after refrigerant system recharges. These high side refrigerant fluctuations are characteristic of the Visteon fixed scroll compressor and not an indication of a falling/failed A/C compressor.

The SC115 A/C compressor has the following characteristics

Scheme 121

1. Tangential mount design - three lugs.
2. The single manifold block of the compressor manifold and tube assembly fits to the suction and discharge ports. Two O-ring seals are used for sealing.
3. An eccentric bushing is driven by the shaft of the A/C compressor.
4. An orbiting scroll driven by the eccentric bushing compresses the refrigerant gas against the walls of the fixed scroll.
5. Single reed-type discharge valve mounted on the back of the fixed scroll. There are no suction valves.
6. Non-serviceable shaft seal fully supported on both sides by bearings.
7. The A/C compressor uses PAG oil or equivalent. This oil contains special additives required for the A/C compressor.
8. The A/C compressor oil from vehicles equipped with a SC115 A/C compressor may have some slightly dark-colored streaks while maintaining normal oil viscosity. This is normal for this A/C compressor because of break-in wear of the scroll seals that can discolor the oil.
9. Use standard oil matching procedures when installing new compressors. The magnetic A/C clutch has the following characteristics
10. It drives the compressor shaft.
11. When battery voltage is applied to the A/C compressor clutch field coil, the clutch plate and hub assembly is drawn toward the A/C clutch pulley.
12. 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.
13. When battery voltage is removed from the A/C compressor clutch field coil, springs in the clutch plate and hub assembly move the clutch plate away from the A/C clutch pulley.

Control Assembly

The auxiliary climate control system has dual controls for the driver and rear passengers consisting of temperature, blower speed, and air distribution mode. The front auxiliary climate control assembly is mounted in the overhead console. The rear auxiliary climate control assembly is mounted in the rear of the front floor console assembly.