A/C will dry the air, helps to keep windows from fogging up as much.
The ac unit compressor will run when it is in defroster mode and heat setting is on.
The heater control valve is stuck open.
That is exactly how a heat pump works in heating mode are you sure it's not a heat pump?
This is so heat (or AC air) will stay in.
Imagine a window AC unit installed backwards, rejecting heat indoors while air conditioning the world, this is a heat pumps heat mode. As the unit is air conditioning in the cool outdoors eventually the outdoor coil will ice up requiring a defrost cycle, defrost is the AC mode except the outdoor fans off to assist with the defrosting. A defrost cycle is time and temperature initiated, time or temperature terminated.
Dry Mode: There are two versions of this and To understand this you have to understand how AC works. AC "Condenses" water From the air on the cold portion of the AC. Dry Mode can be two things. A De-humidifier mode designed to dry the air in a room or building Dry the interior workings of the AC to prevent mold and mildew inside.
4 which system?
This is the opposite of the most common fail mode for the GC. Usually the problem is no heat. However, the switch between heat and AC is controlled by the blend doors and they can break and fall into the wrong place blocking AC. More information is needed. Check the diagnostic procedures at heatertreater.net
do you have a heatpump or a/c? if it is a heat pump you can,that is what happens when the system goes in to the defrost mode. if its freezing you could be low on charge or or bad defroster board or even worst a bad reverseing valve.
why does my ford focus over heat when i turn the ac on
the blend door may not be operating properly, or a vacuum leak may be present.
A heat pump is an air conditioner working in reverse. When the unit is in cooling mode, it moves heat from the interior to the exterior. When the unit is in heat mode, it moves heat from the exterior to the interior.In most cases, the thermostat controls the necessary components that perform the reversing process necessary to change from heating mode to cooling mode.