sounds like your heater core has gone to seed. generally heater core replacement involves removing the dash and should be done by a mechanic or car nut. the cost of this procedure is dictated by the difficulty (time involved) of the process. you can expect to be set back at least a few hundred bucks.
check the water level of your radiator first. The heater gets it heat from the radiator/ cooling system. The heater intake hose is normally located at the top of the engine, meaning that when the water level is low the heater is the first thing to loose water, which will result in cold air coming from the vents.
Your heater will blow cold air only.
In most cases when a vehicle heater that has been working properly in the past begins to blow cold air the cooling system is low on coolant. It could also mean that your heater core is clogged. A good coolant system flush might take care of this, otherwise you may have to have it replaced.
It doesn't really blow it out it just warms the cold air.
you need to replace your heater core
it wont blow heat itll blow cold air
heater core possibly plugged and leaking
you are low on coolingliquid !
The front expansion valve is clogged.
More than likely your heater core is plugged, and will need to be replaced
No, not if it's on a heat setting. Most home thermostats have a "Fan" setting that will blow cold air if the attic is cold.
you may not have the heater water hoses plugged in
replace front heater corefront and rear have independent heater cores
the heater core was stopped up just flushed it out ok now
You have run out of coolant, or the heater matrix is blocked.
Could be a bad thermostat.
Cause its broke!
Low on coolant, stuck open thermostat, plugged heater core, faulty temperature blend door,
Low coolant in the system. Defective heater control valve. Clogged heater core.
the blown head gasket would make it over heat. but it wouldn't cause the heater to blow cold, it should actually blow hot if that is wat happened
if youre trying to turn the heater on and cold air comes out, then its most likely the heater core
Poor coolant circulation from a plugged up heater core. Try flushing the heater core and replacing the thermostat.
THE CAUSE for this is that when your cold air is on the petrol is used to create air. and that is how cars create cold air
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.
Could be the Climate Control Unit or Clogged heater core.