Over-obvious answer? Your radiator, or one of your radiator hoses, leaks - badly.
It's probably the radiator. Make sure there's enough coolant in the radiator.
Your cooling system is empty of coolant and you must have a large leak somewhere.
Because you don't have enough coolant in your radiator.
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.
Have you checked your thermostat?
check the coolant level, or, possible stuck thermostat.
This is caused by low coolant levels in most instances.
no belt, low coolant, failed water pump,
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.
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.
Same problem vectra heater only blowing cold checked water coolant and it was empty. Topped up now blowing hot just hope I not got head gasket probe
That is exactly how a heat pump works in heating mode are you sure it's not a heat pump?