GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2009 🢒 CTS 🢒 Driveline/Axle 🢒 Rear Drive Axle 🢒 Differential Oil Cooler Replacement

Removal Procedure
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.

    2. Object Number: 2183142 Size: SH
  2. Loosen the hose clamps for the clamps inlet and outlet hoses.

    3. Note: When removing or installing of the inlet or outlet hoses, note the routing of the hoses for the proper clearances.

  3. Remove the inlet (3) and outlet (1) hoses and clamps from the differential housing.
  4. Plug or cap the outlet fitting.
  5. Disconnect the electrical connector for the temperature switch (2).
  6. Support the differential cooler assembly with a transmission jack or the appropriate support.

    7. Object Number: 1739947 Size: SH
  7. Disconnect the electrical connector for the differential cooler (1).
  8. Remove the differential cooler wiring harness from the retainer on the frame.
  9. Remove the hose from the differential coolant pump to the cooler. Refer to Differential Oil Cooler Inlet Hose, Cooler Outlet Hose, and Pump Inlet Hose Replacement.
  10. Remove the mounting nuts (2) for the differential cooler assembly.
  11. Remove the differential cooler assembly (3).

    12. Object Number: 1740546 Size: SH
  12. Disconnect the electrical connector for the differential cooler fan (1).
  13. Remove the retaining nuts for the differential cooler (2).
  14. Remove the differential cooler (3) from the carrier (4).

Installation Procedure

    Object Number: 1740546 Size: SH
  1. Install the differential cooler (3) in the carrier (4).

    2. Caution: Refer to Fastener Caution in the Preface section.

  2. Install the differential cooler retaining nuts (2) and tighten to 9 N·m (80 lb in).
  3. Install the hose from the differential coolant pump to the cooler. Refer to Differential Oil Cooler Inlet Hose, Cooler Outlet Hose, and Pump Inlet Hose Replacement.
  4. Install the differential cooler wiring harness in the retainer on the frame.
  5. Reconnect the electrical connector for the cooling fan (1).

    6. Object Number: 1739947 Size: SH
  6. Install the differential cooler assembly (3) on the rear floor.
  7. Position the coolers hoses over the rear drive axle.
  8. Install the mounting nuts  (2)  for the differential cooler and tighten to 9 N·m (80 lb in).
  9. Remove the support for the differential cooler assembly.
  10. Connect the electrical connector (1).

    11. Object Number: 2183142 Size: SH
  11. Remove the cap or plug from the outlet fitting.
  12. Install the differential cooler inlet (3) and the outlet hose (1) and tighten the clamps to 3 N·m (27 lb in).
  13. Reconnect the electrical connector (2) to the temperature switch.
  14. Refill the differential cooler with the proper fluid. Refer to Axle Lubricant Change.
  15. Remove the support and lower the vehicle.