The steam could be coolant from a bad heater core.
Sounds like your heater core has a leak and the sweet smell is your coolant.
The heater coil probably has a leak causing steam and vaporized antifreeze to be released into the vents. Is it using coolant?
heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this
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..
Your front blower motor has gone out. There is a front and a rear blower motor.
most likely it's a bad thermostat, or your vents not working properly.
Check the following.......... 1. Vacuum leak, broken vacuum line or disconnected vacuum line. 2. A/C - heater inside car door operation.. 3. A/C - heater controller..
You have a broken vacuum hose under the hood that supplies the switch.
It should blow through the floor vents. Modern vehicles generally use movable baffles in there HVAC systems, to direct air flow where the controls indicate. If the controls allow airflow to the floor, but nothing flows out, there is a malfunction between the control switch and the actuator that directs the flow.
SOUNDS LIKE THE INTAKE GASKET BLEW, OR THE HEATER CORE FAILED.. EITHER WAY, THIS IS A COSTLY REPAIR.
Vent bypasses heater core when open,it is for outside air only...I know this because I just replaced heater core.