Call a heating specialist. Heaters are too dangerous for amateurs to fool with. There is danger of fire and, in the case of gas, asphyxiation if they are not properly repaired and adjusted.
Your cooling system is empty of coolant and you must have a large leak somewhere.
One reason your home electric heater is blowing cold air is the heating elements are burned out. A bad thermostat may also be the problem.
There are many reasons that the cars heating system may alternate between blowing hot and cold air. Some common causes of this include the heater core and air pockets in the coolant.
check the coolant level, or, possible stuck thermostat.
This is caused by low coolant levels in most instances.
No, there is no blower or duct work. You can't chill the water in the heating system and get cold air out of it.
The electric heating elements are probably turned on.
Over-obvious answer? Your radiator, or one of your radiator hoses, leaks - badly.
It is likely you have a heat pump. A type of air conditioning system which heats as well as cools. If there is cold air coming from the outdoor fan, you are in the heating mode. If you are calling for cooling at the thermostat, and there is cold air coming off the fan from the outdoor coil, there is a problem with likely the low voltage wiring.
It's probably the radiator. Make sure there's enough coolant in the radiator.
That is exactly how a heat pump works in heating mode are you sure it's not a heat pump?
It is because your heater is having to heat up so its blowing cold air out while its heating up.This means your heater is not very efficient and it needs to be checked.