to heat a space. the ducts move from the evaporator(a/c) to the heater core, where the core has hot antifreeze going thru it and a blower motor blowing across it produces heat
A hair dryer blows hot air out.
To effectively regulate the temperature in a hot room using a fan, you can blow air out of the room to remove hot air and bring in cooler air from outside. This creates a flow of air that helps to cool down the room. Alternatively, you can blow air into the room to create circulation and distribute the cool air from an air conditioning unit more evenly.
Blowing hot air out is better for effective temperature control in a room.
For optimal air circulation, the fan should blow out of the window. This helps to push hot air out and draw in cooler air from outside.
Yes, blowing hot air out can improve ventilation and air circulation by helping to remove stale air and bring in fresh air.
The front expansion valve is clogged.
May be a defective thermostat or heater core
You have run out of coolant, or the heater matrix is blocked.
You are low on coolant to the heater core.
if the heater does not blow out warm air change the setting.
replace anti-freeze, replace thermostat
check heater fan to see if it is working.
Because your thermostat is probably stuck open
One of the reasons a 2000 Jeep Cherokee heater would randomly blow cold air and then hot air and then cold might be that there is a problem with the hot/cold duct. The air or a vent might be inadvertently blowing periodically.
The engine needs to be hot in order for you to get got air. On a cold morning, even if you let your truck run for a while, will not get hot enough to blow hot air usually until you drive it for a little bit. When it gets at or near operating temperature there is no reason that it shouldn't blow hot air.
Your front blower motor has gone out. There is a front and a rear blower motor.
Low coolant, failed thermostat, partially plugged heater core...............