Almost 100% certainty
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.
That's what that sounds like. Dont use your heater at all, its just dumping antifreeze into your car, take it to a dealer.
Assuming that the blower motor isn't on fire, it's probably the heater core. Does the smmoke smell sweet. If yes that's antifreeze. The smoke does smell like anti-freeze. Does this suggest that the heater core is the problem?
Check the Heater Core? Did it smell like oil or antifreeze. My Heater Core went, started blowing out smoke from the vent. Most Likely the Problem. "smoke" poured into my 1991 when the ac blew out all the freon and froze up the outside temp gage.
The smoke is actually antifreeze mixed with air. The most common cause of this is a leaky heater core.
in my experience it is a slight leak in heater core it will be antifreeze causing this replace heater core and problem will be fixed
Probably a blown or leaking head gasket.
Coolant lines from the water pump to the heater core are probably leaking 1) See if you are low on antifreeze 2) Check smell of smoke/steam if it has a sweet smell that's your problem If neither are true you could have a bad valve cover gasket dripping oil onto the exhaust
heater core is shot and you have to get a new one
you need a new heater core
your truck is likely leaking coolant due to a blown head gasket making white smoke and coolant smell