Likely, your blower (fan) is out.
Forced convection. Heat is transferred through the air in the room by the movement of the air from the heating vents.
The heat pretty much stays in your house. The heat from the furnace rises (because the molecules have moved apart) and goes to the top of the house. There it cools down, and because it is not more dense, it sinks back down to the furnace where it can be made warm again. All this happens through a process of heat transfer call convection.
Air inside the house next to a heat source is heated. The warmer air is less dense than colder air so it rises and moves around in currents. The warmed air may escape through gaps in doors or open windows, or it may transfer it's heat to a wall, which may allow heat to then escape through the wall by conduction.
Heat energy is lost from homes through conduction, where heat escapes through walls, ceilings, and windows; convection, where heated air rises and escapes through gaps and vents; and radiation, where heat is emitted through surfaces like windows. Inefficient insulation, drafts, and poor sealing can contribute to heat loss.
No. A blow dryer sucks in air, heat/cools it, then blows it back out again. Without atmosphere, there is no air, and without air, there is no blow dryer.
the heat blows out the defrost when it should blow out floor vents only
Because the air selector died.
you need a head casket
Because most likely there is still coolant circulating through the system.
somtimes a mouse moves into the blower motor and makes a nest ?
Yes. The heater core provides the heat which blows out your vents. The heater core has engine coolant flowing through it (it is like a mini radiator) which creates the heat which warms the air that comes out your vents. If you have low coolant, there may be no coolant circulating through heater core, thus causing cold air to blow out vents.
In a Ford Freestar, the heat typically blows from the dashboard vents rather than the ceiling vents. The vehicle's heating system is designed to direct warm air through the front vents to provide comfort for the driver and passengers. If you're experiencing issues with airflow or heat distribution, it may be worth checking the HVAC system or consulting a mechanic.
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
More than likely you will not have heat being the water wont be circulating through the heater core , When the hot water passes through the heater coil the air passing through the heater coil makes heat blow out the vents when you have selected a heat setting on your controls.
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.
some thing is probley cloging the vents take it appart and ckeck.
Forced convection. Heat is transferred through the air in the room by the movement of the air from the heating vents.