Bad selector? vacuum leak at engine or vacuum motors under dash
2003 crown vic air conditioning vent dont blow
The steam could be coolant from a bad heater core.
You have a broken vacuum hose under the hood that supplies the switch.
You have either a cracked heater core or bad heater hoses that are allowing antifreeze to enter into the vehicle............
The a/c - heater controller is out...........
under the hood. on the passenger side. near the silver air conditioning can looking thing. you will see a black thing with 3 vacuum lines attached. this is what controls the heater vents.
!. You could have a bad heater core. 2. You could have a blown fuse. 3. Your thermostat could be bad. 4. Your air conditioning could be on.
smoky mist coming from the heater vents.
The heater may not be on - but the fan still blows air through the vents when they're open !
There are heater doors on the heat blower box that direct the path of the heat. Apparently the heater door to the floor vents is stuck closed.
Undo the 2 screws at the bottom of the trim then pull the trim out by pulling on the heater vents at the top.
Fuel level, heat or air conditioning up, both high and low, high only, floor only. Center vents are for air conditioning output only, no heat. Heat is designed to blow out side and floor vents only. NOT center. Center is only for air conditioning or summer vents.