check your antifreeze and water...maybe water pump too.check for a thermostat that is not closing ,.in other words a faulty thermostat
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.
One possible reason for a vent blowing cold air when the heat is on could be a problem with the heating system, such as a malfunctioning thermostat, a clogged air filter, or a faulty heating element. It is recommended to have a professional HVAC technician inspect and repair the issue to ensure proper functioning of the heating system.
check the coolant level, or, possible stuck thermostat.
This is caused by low coolant levels in most instances.
Your emergency heat may be blowing cold air instead of warm air because there could be a problem with the heating system, such as a malfunctioning heating element or a lack of fuel. It is important to have a professional inspect and repair the system to ensure it is working properly.
Your central heat may be blowing cold air due to issues with the thermostat, a malfunctioning heating element, or a problem with the ductwork. It is recommended to check these components and consult a professional if needed to diagnose and fix the issue.
Depends on your location.
Over-obvious answer? Your radiator, or one of your radiator hoses, leaks - badly.
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.
The most common reason the heater is blows cold air on a 1999 Ford Winstar is a bad thermostat or blocked heater core.
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.
It's probably the radiator. Make sure there's enough coolant in the radiator.