Heat worked before, but doesn't now... on 2003 Pontiac Montana

My montana enginge temp was running way too cool, so we replaced the thermostat, then noticed antifreeze leaking. We changed the water pump, and now the heat doesn't work. PLEASE HELP!!!???

Asked by for the 2003 Pontiac Montana
I think you may have air in the heater system and you need to bleed the air from the system. You may be able to bleed the air at the heater hose connections.