Chevrolet 1995 Lumina Owner's Manual page 184

. .
!
,
"-
I
3.4L LQ1 (Code X) Engine
3.4L V6 (VIN Code X): There are two bleed valves.
They are located on the thermostat housing and heater
inlet pipe.
4. Fill the radiator with
the proper
mix,
up to
the base of the filler
neck.
If you see a stream of coolant coming from an air
bleed valve, close the valve. Otherwise, close the
valves after the radiator is filled.
5. Rinse or wipe any spilled coolant from the engine
and compartment.
5-20