Removal Procedure

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Rotating Retaining Ring

Courtesy of GENERAL MOTORS CORP.

Disengage the plastic caps from the quick connect fittings. Pull the caps back along the pipe.
Using a bent-tip screwdriver or equivalent, pull on one of the open ends of the retaining ring in order to rotate the retaining ring.
Rotate the retaining ring around the quick connector until the retaining ring is out of position and can be completely removed.
Discard the retaining rings.

Fig 2: View Of Engine Oil Cooler Line Connections

Courtesy of GENERAL MOTORS CORP.

Remove the engine oil cooler line from the quick connector fitting at the radiator.
Pull the lines straight out from the connectors.
Clean all of the components in a suitable solvent, and dry them with compressed air.
Inspect the fittings, the connectors, the cooler lines, and the cooler for damage, distortion, or restriction. Replace parts as necessary.