Mercury 4L3Z-19703-AB Compressor Assembly

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To remove the air conditioning compressor, discharge the system and remove the drivebelt. For gasoline models, raise the vehicle, remove the right front wheel, release the clips on the lower fan shroud, and remove the fender splash shield if necessary. Disconnect the compressor lines, transmission fluid cooler lines (for automatic transmission), and electrical connectors. Remove the compressor mounting bolts and take out the compressor. For 7.3L diesel engines, disconnect the electrical connector and compressor lines, remove the old O-rings, and remove the compressor. For 6.0L and 6.4L engines, remove the transmission cooler, inner splash shield, disconnect the manifold and wiring, remove the compressor mounting bolts, and remove the compressor. If installing a new compressor, follow manufacturer's directions and transfer the clutch if needed. Replace manifold O-rings and lubricate with refrigerant oil. Installation is the reverse. Replace the orifice tube and have the system serviced by a professional.

The evaporator is mounted inside the heater housing and requires removal of the instrument panel. Unbolt the heater unit assembly from the firewall to remove the evaporator. For 2008 and later models, detach the wiring harness and remove the lower radiator cross member. Disconnect the refrigerant lines from the condenser and support the cooling module. Remove the mounting bolts from the condenser and remove it.

Before reconnecting the inlet and outlet lines to the compressor, replace all manifold O-rings and lubricate them with the appropriate refrigerant oil.

Replace the orifice tube. Have the system evacuated, recharged, and leak tested by the shop that discharged it.

Loosen the right front wheel lug nuts, raise the vehicle and secure it on jackstands, and remove the right front wheel. Remove the right front fender splash shield. Remove the drivebelt. Disconnect the electrical connector from the compressor clutch field coil.

Loosen the right front wheel lug nuts, raise the vehicle, and support it securely on jack stands.