Chevrolet Cavalier Heater Hose Replace/Remove

Replaced The Water Pump And Thermostat. Filled Up With New Coolant Started Engine No Warm Air Inside Interior. I Marked The Heater Hose...

My Cavalier All Of The Sudden Overheated A Week Ago. The Car Was Full Of Fluid. I Replaced The Thermostat, But Im Not Sure If Its The Way...