CHRYSLER CIRRUS HEATER

How Do You Replace A Heater Core On A 1997 Chrysler Cirrus

I Only Get Semi Warm Heat, I Change The Thermastat And Filled Coolant, Seems To Be Flow And Does Not Overheat, Why Wont Get Hot?

No Hot Air Coming Out When Heater Is Turned On, I Have Made Sure There Is A Thermostat [replaced It] With New One Have Made Sure Core...