Removal Procedure

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
Remove the lower air deflector. Refer to RADIATOR AIR BAFFLE AND DEFLECTOR REPLACEMENT - LOWER .
Remove the radiator drain plug and seal. The seal usually comes out attached to the plug.
Remove the body of the drain plug. Use your fingers or needlenose pliers to disengage the locking tabs from the side tank.

Fig 1: Removing Radiator Drain Plug
Courtesy of GENERAL MOTORS CORP.
Clean the drain cock and the drain cock plug.