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.
your heater core has got a leak and needs to be replaced
Heater core is leaking
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 ?
If you mean "why", then the answer is that there is a leak in the heater core.
Have you spilt some on the radiator?
smell of antifreeze and no visable leaks usually indicates that the heater core needs replacing
Could be that your head gasket is beginning to go. Does it smell strongest when you first start the car, then go away? Look for excess steam coming out the tailpipe when you first start it.
if it smells like antifreeze inside the cockpit then your problem is the heatercore, since you can't see it.
Depends on the smell. if it smells sweet, like antifreeze, then it is probably a leak in the heater core. This is a small radiator that runs from the main radiator and makes hot air for the heater. If it smells like gasoline, may be a gas leak. Do not drive the car, get it fixed by a professional. If it smells like smoke, it may be an oil leak. get it checked.
It is a 1998 Chevy Blazer. I don't know how I posted this topic in the first place???
your heater core is probably bad.