The motor which blows air through the vents.
There are heater doors on the heat blower box that direct the path of the heat. Apparently the heater door to the floor vents is stuck closed.
Any of the following can cause this......... 1. Bad a/c - heater controller.. 2. Bad a/c - heater controller inside door operation.. 3. Bad, broken or cracked vacuum line/lines..
Bad heater core.
The heater core has failed.
Could be that your heater core is leaking May also have a plugged evaporator hole.
Leak in heater core. Replace core.
Leaking heater core
Most of the time it is caused by a hole in the heater core, do you smell a sweet smell? The sweet smell would be the antifreeze.
Warm(er) air rises - if vents were high up there would be little circulation without fans.
SOUNDS LIKE THE INTAKE GASKET BLEW, OR THE HEATER CORE FAILED.. EITHER WAY, THIS IS A COSTLY REPAIR.
Poor coolant circulation from a plugged up heater core. Try flushing the heater core and replacing the thermostat.
The heater core is leaking coolant.
If that smoke is more like steam, you have a leaky heater core.
Sounds like it could be a bad ground in heater motor circuit
The most likely cause would be a vacuum leak at the rear of the engine or a defective selector switch.
Check the heater core, it is probably bad. It could be heater hose connections to the heater core, but I would bet on the heater core going bad.
If we are talking rain water not engine coolant I would suspect the drains under the cowl are plugged up with debris (leaves and such). If it is engine coolant then I would suspect the heater core is leaking.
Is it smoke or is it atomized freon leaking from the AC system? If it fogs the windshield and smells funny, you may have a leak in the AC/Heater system.
Heat and steam coming from the dash and air vents after replacing the water pump means that a hose is hooked up backwards in the new installation. The heater is actually taking on water when it is supposed to only take on hot air.
check the drain hose on the out side of the fire wall, most time on the pass side. if its cloged un cloge it and clean out the heater box
I don't know why the vent would not open for the defrost, but it may be related to the fact that your heater core is blown. If your getting nothing but cold air out of the vents when the heat is on, your core is finished and if the core is finished then it is likely related to your vent not opening/switching. Something''s wrong with your heating either way.
The heater core or air conditioning core is broken and leaking fluid into the heating unit. simple to fix. just install a new heater core.