How do you bleed air from coolant

The 2004 Impala has 2 bleeders, one on top of the thermostat housing (top hose) & above the water pump (block/heater hose). When system is up to temp, check these for air bubbles/till only liquid, then lightly tighten. May need to check radiator when cool, & sometimes may need to bleed again (normally at the thermostat housing). Should solve the issue...