PONTIAC GRAND PRIX HEATER NOT WORKING

I Just Replaced The Blower And Just Before If Replaced It The Heater Fan Only Worked On High And After I Replaced The Blower It Still Only...

The Heater In My Car Does Not Blow Hot Air. What Could It Be?

My A/c Works, Fans Work On All Speed Settings, Car Does Not Overheat, Blower Motor Works. But I Have No Heat. Just Blows Cold Air.

The Car Provides Some Heat But It's Not Enough In Very Low/cold Temperatures. The Car Doesn't Overheat Or Have Any Coolant Leaks. I...