I replaced the heater core, and t-stat.

When i turn the **** to warm, it still blows cold air, like it would when the AC is on.

Also, when i turn the **** over to warm or cold, i can hear the blend door actuator operating. So that would mean its ok, right?

The lines going through the firewall to the core are warm..so that means its flowing right??

 

check the vacuum lines around your blower motor