your heater core is probably bad.
your truck is likely leaking coolant due to a blown head gasket making white smoke and coolant smell
your heater core has got a leak and needs to be replaced
car smoke is coming in threw my vents in truck it smells like carbon minioxde
If you mean "why", then the answer is that there is a leak in the heater core.
I'm not a mechanic / technician but it sounds like your heater core is leaking Have you noticed if your engine coolant level is going down ?
smell of antifreeze and no visable leaks usually indicates that the heater core needs replacing
if it smells like antifreeze inside the cockpit then your problem is the heatercore, since you can't see it.
it's a sweet smell, but it's a nasty smell. it smells like burning coffee and antifreeze. sounds weird but that's pretty much what it smells like
It is a 1998 Chevy Blazer. I don't know how I posted this topic in the first place???
Sounds like a leak in the heater core.
The smoke is actually antifreeze mixed with air. The most common cause of this is a leaky heater core.
Telltale sign is WHITE smoke coming from the exhaust that smells like Antifreeze.