Oldsmobile 1995 Cutlass Supreme Owner's Manual page 191

3. After the engine cools, open the coolant a i r bleed
valve.
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"3; 1L L82 (Code M)
Engine
3.1L V6 (VIN Code M): There are two bleed valves.
One is located on the thermostat housing. The other is
located on the thermostat bypass tube.
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