the amount of hot gas is not enough to change the form of all the liquids trap on it.
By your question, I cannot tell of which component of the system you are talking about? It sounds like you are talking about (for a heat pump system) the outdoor coil? If that is what you are talking about, I would say that you have either a failed circuit board (most machines reverse the flow of refrigerant and stop the outdoor fan during defrost cycle). I would say that your reversing valve is either not energizing or is defective or your circuit board.
because it is broken
If central air conditioner turns on but is not blowing through the vents, check the filter. If it is dirty, change it. Change the thermostat into cool, this will defrost the air conditioner.
The fan is not working.
crack a window open to let the moisture of your breathing get out and set your air control to exterior air
If you feel no air blowing at all (when you are not moving) then your fan is not blowing. If it is blowing air, and it is cold, when the heater is on, then most probably your heater core is leaking, or is clogged. These are easily replaceable and go bad all the time in older cars.
warm air, the heat is what is being taken out of the inside of the house.
does fan door motorized or on a vaccuum line when you switch from AC to defrost?
Car not blowing air or heat
That means either you have air in your heater core or your heater core is being bypassed
check the antifreeze
rear air unit has a air blending door solenoid, and is probably out. or broken making a clicking noise
Turn it on high