I have a 2002 ford Taurus with a weird heating problem. The current situation is this; I have heat but it takes forever to function properly. The car has to run for a good hour or more before it starts to blow hot air. I have checked the thermostat, replaced the water pump, reverse flushed the heated core, all check out fine. Coolant levels are full and I have burped the system. I then moved onto the heater control valve & temperature control switch along with the blend air door actuator. As far as I can tell all these devices and components are functioning properly. However my problem Still persist, 5, 10, 20 minutes after starting my car in the morning it's still blowing lukewarm air.

of anyone has experienced this problem before and has a solution PLEASE let me know, muchley appreciated. Thank you