heater problems

I just had my heater coil flushed and a coolant flush on my 98 Ford Taurus, but my heater isn't working the way it's supposed to.
It's only blowing out luke wark air now. Can someone please help?

Even though your heater core has been recently flush, it still maybe clogged. After your car has gotten up to operating temp, check both hoses going the the heater core and feel if they are both hot.