no.....the heater would have to be leaking
Leak in heater core. Replace core.
If that smoke is more like steam, you have a leaky heater core.
The heater core has failed.
You need to check and/or replace the heater core
heater core needs replacement
The heater core is leaking coolant.
Replace the heater core. It is leaking.
The heater core is leaking coolant.
This is caused by a faulty heater core that has corroded and now has a leak. It needs to be replaced.
Heating hoses are exposed and need to be replaced. The heater core is leaking coolant.
That has happened to me twice. Once on a Chevy Van and most recently on a 1995 Ford F-150. Both times it was the heater core that needed to be replaced.
the heater core is behind the dash, most of the dash needs to come out and i would get a Chilton or Haynes book.