Is the vehicle equipped with dual climate control? If so just adjust the driver side to provide the temperature of air that you want. If it is not equipped with dual climate, it is probably an insulation issue (Exhaust close to air ducts etc.)
Leak in heater core. Replace core.
Sounds like you have the beginnings of an a/c vacuum leak. Our Expedition did the same thing and eventually it defaulted to blowing out of only the heater vents, which is the default when things aren't routing properly.
perhaps because the engine running heats coolant that cycles through the heater core and has air blowing across the aluminum to exchange the heat into the air that is forced through the vents
heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this
Your front blower motor has gone out. There is a front and a rear blower motor.
The blend door actuator may not be working.
most likely it's a bad thermostat, or your vents not working properly.
you may not have the heater water hoses plugged in
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..
Cause its broke!
You have a broken vacuum hose under the hood that supplies the switch.
The steam could be coolant from a bad heater core.