Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The optional oil cooler is either an integral part of the radiator or a separate unit placed in front of the radiator. The cooler lines and hoses are serviceable.

Disengage the plastic caps from the quick connect fittings. Pull the caps back along the pipe.
Hold one leg of the retaining clip.
Using a small pick-type tool or bent screwdriver, gently pry the other end of the retaining clip from the quick connect fitting.
Rotate the retaining clip out of the quick connect fitting. Remove the retaining clip completely.
Discard the OLD retaining clip.

Fig 1: Prying Other End Of Retaining Clip From Quick Connect Fitting
Courtesy of GENERAL MOTORS CORP.
If equipped with a 6.0L engine, perform the following:
1. 6.1. Open the oil cooler hose clip located on the lower fan shroud.
2. 6.2. Remove the oil cooler hoses from the clip.
3. 6.3. Gently pull the oil cooler pipe fittings straight out from the radiator quick connect fittings.
4. 6.4. Raise and suitably support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
Fig 2: Removing Oil Cooler Hoses
Courtesy of GENERAL MOTORS CORP.
Remove the exhaust manifold pipe nuts.
Reposition the pipe out of the way.

Fig 3: Removing Exhaust Manifold Pipe Nuts
Courtesy of GENERAL MOTORS CORP.
If equipped with a 8.1L engine, perform the following:
1. 9.1. Remove the oil cooler hoses from the clip.
2. 9.2. Gently pull the oil cooler pipe fittings straight out from the radiator quick connect fittings.
3. 9.3. Raise and suitably support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
Fig 4: Removing Oil Cooler Hoses
Courtesy of GENERAL MOTORS CORP.
If equipped, remove the engine shield bolts.
Remove the engine shield.

Fig 5: Removing Engine Shield
Courtesy of GENERAL MOTORS CORP.
If equipped with a 6.0L engine, perform the following:
1. 12.1. Remove the oil cooler hose bracket bolt (1).
2. 12.2. Remove the oil cooler hose adapter bolts (2).
3. 12.3. Remove the oil cooler hose assembly and gasket.
  Discard the gasket.
4. 12.4. Inspect the fittings, connectors and cooler hoses for damage or distortion.
Fig 6: Removing Oil Cooler Hose Assembly And Gasket
Courtesy of GENERAL MOTORS CORP.
If equipped with a 8.1L engine, perform the following:
1. 13.1. Remove the oil cooler hose bracket bolt.
2. 13.2. Disconnect the quick connect fittings (1) at the engine.
3. 13.3. Remove the oil cooler hose assembly.
  Discard the gasket.
4. 13.4. Inspect the fittings, connectors and cooler hoses for damage or distortion.
Fig 7: Removing Oil Cooler Hose Assembly
Courtesy of GENERAL MOTORS CORP.