Removal Procedure

Raise and the support vehicle. Refer to LIFTING AND JACKING THE VEHICLE .
Remove the engine oil cooler lines support clamp bolt.

Fig 1: Engine Oil Cooler Lines Support Clamp Bolt (2WD)
Courtesy of GENERAL MOTORS CORP.

Important: Have a drain pan ready for the engine oil to drain into.
Remove the bolt attaching the engine oil cooler lines to the oil filter adapter.
Hold the cooler lines below the bottom of the radiator to drain the engine oil.
Remove and discard the seals.

Fig 2: Engine Oil Cooler Lines At Oil Filter Adapter (2WD)
Courtesy of GENERAL MOTORS CORP.
Lower the vehicle.
Remove air cleaner assembly.
Remove the engine oil cooler line retaining rings from the engine oil cooler line quick connectors at the radiator engine oil cooler inlet and outlet. Follow the next 2 steps for the proper retaining ring removal procedure.

Fig 3: Engine Oil Cooler Line Retaining Rings (2WD)
Courtesy of GENERAL MOTORS CORP.
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 4: Pulling End Of Retaining Ring Using Bent-Tip Screwdriver (2WD)
Courtesy of GENERAL MOTORS CORP.
Remove the engine oil cooler lines from the quick connectors at the radiator engine oil cooler inlet and outlet.
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.
Flush the engine oil cooler and engine oil cooler lines with the same type of engine oil normally circulating through the engine.

Fig 5: Engine Oil Cooler Lines (2WD)
Courtesy of GENERAL MOTORS CORP.