Probably blocked heater matrix. Best thing to do is flush the cooling system with the best stuff you can get.
it is blocked and needs to be flushed out
The most common reason the heater is blows cold air on a 1999 Ford Winstar is a bad thermostat or blocked heater core.
Low on coolant. Stuck open thermostat. Plugged heater core. Temp blend door inop.
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
There are several possible reasons why your heater is only blowing cold air. It could be due to a malfunctioning thermostat, a problem with the heating element, a clogged air filter, or low levels of coolant in the system. It is recommended to have a professional inspect and diagnose the issue to determine the exact cause and necessary repairs.
Only the fan is working, there is no gas burning (gas heater) or the electric heating element is not working(electric heater)Answeris it electric gas or oil Its gas.
If one side of a 2002 Laguna dual heater only blows cold air, it could be due to a few reasons. A common issue is a malfunctioning blend door actuator, which regulates the temperature of the air by controlling airflow from the heater core. Additionally, low coolant levels or a clogged heater core can also prevent hot air from reaching that side. Lastly, there may be a problem with the climate control system or a leak in the ductwork.
No one knows if:The heater is NOT blowing - or blowing on high speed only, or... The heater IS blowing, but the air is NOT hotEither way, the "Related Questions" below will get you started
The heater is blowing out cold air only
If the heater in a Fiat Scudo is only blowing cold air, it could be due to several issues. Common causes include low coolant levels, a malfunctioning thermostat, or a blocked heater core. Additionally, issues with the heater control valve or a faulty blower motor can also prevent warm air from circulating. Checking for coolant leaks and ensuring the heating system is properly bled can help identify the problem.
It sounds like your switch from hot to cold is stuck on cold
The heat may be blowing cold air because there could be a problem with the thermostat, a lack of enough coolant in the system, a malfunctioning heater core, or a faulty blend door. It is recommended to have a professional inspect and diagnose the issue for proper repair.