I have a 99 Civic the Heat works great except when i put it to the floor no heat....... even the center vents above the raido dont produce heat no matter what i do... the heat that works comes from the side vents right and left sides please help
when you push the buttons to switch zones, can you hear anything behind the dash moving? if not, you may have a bad vacuum line back there that wont move the flaps to change zones, or maybe they are stuck