No More Radiator Drain Valves in GM vehicles
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Starting in 2003, GM discontinued the use of a drain hose attached
to the radiator drain valve. Later, GM discontinued the use of a
radiator drain valve altogether. Some models continued to include a
drain valve, but the valve was permanently sealed during production. Do
NOT try and operate these sealed valves-they will break. GM warns that
if you try to remove and replace the valve, debris from the breakage may
circulate throughout the system and damage water pump, heater core, and
thermostat components.
The bottom line is that you must now either remove the lower radiator
hose or use a siphon to remove coolant from the radiator. This bulletin
applies to all 1998-04 GM cars and trucks.
