It should blow through the floor vents. Modern vehicles generally use movable baffles in there HVAC systems, to direct air flow where the controls indicate. If the controls allow airflow to the floor, but nothing flows out, there is a malfunction between the control switch and the actuator that directs the flow.
You have a leaking heater core. You might smell antifreeze if you turn on the defroster.
your switch cable might be broke you will have to remove your dash
On the passengers side floor board or if the heater core just has a small crack then it will fog up the windshield when the defroster is turned on and smell very bad......
it is normal. when you use the defroster, the air conditioner is also working to help dry the air passing over the windshield. this moisture is condensed by the cool evaporator and drained through the floor of the car.
What causes heat to only come out of the defrost and vent but not the floor of a 1995 S10 Blazer?
Finding coolant on the passengers side floor. Turning on the defroster and the inside of the windshield fogs up. Sweet smell of coolant inside vehicle.
Water can get in when the firewall flashing is missing outside under the windshield cowling. The water gets into the heater/defroster system and then drains on to the floor.
Typically the front passenger side floor/carpet gets soaked with engine coolant and when you turn on the defroster, the inside of the windshield fogs up.
Low coolant level? Thermostat opening too soon? Plugged or restricted heater core? Water pump not circulating coolant? System airbound?
the middle vents only supply air from the ac unit using a separate in dash fan. the floor and defrost vents come only from the heater
make sure the floor has no water damage, a water heater that size will weigh 350 lbs when full. it may fall thru if floor has any rot in it.
busted raditator , check heater-core . most are found inside up under your dashboard . hope that helps you !