when you put the heat to floor, do you feel it coming out any of the other vents could be the damper for the floor isn't closing fully
When FLOOR is selected:
• The air inlet duct door is in the no vacuum position, blocking recirculated air and admitting outside air.
• The floor/panel door is in the full vacuum position, directing all airflow to the heater outlet floor duct.
• The temperature can be adjusted to mix air flowing through and around the heater core to achieve the desired temperature level.
• The panel/defrost door is in the no vacuum position, blocking air circulation to the instrument panel A/C registers.
• The A/C compressor will be disabled when FLOOR is selected.
• The blower motor is on.