First thing to look at is coolant level. It sounds like the coolant pump will push coolant to the heater core and then stops pumping because it has air because to low. If coolant level is full, the vanes on the coolant pump might be spinning on the shaft, in which case you will have to replace the pump.
Cloged heater core
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Low coolant level will cause this. A vacuum leak to the water valve that switches on the hot water to the heater core will cause this too.
SOURCE: Heater doesn't blow hot air
First check the coolant level in the radiator. Check your heater core hoses on the firewall underneath the hood. Let the car come up to temp. and feel the two hoses. If only one of them is getting hot you may have bad heater core or a bad heater control valve.
SOURCE: 2001 malibu-heater is blowing cold air
sounds like you have a bad temperature sensor in dash or the cable has eitehr broken or come off the heater switch under the dash!!
SOURCE: '98 S-10 heater blowing cold air - not hot air
will the air flow switch from floor to the mid to defrost? if so then we have a problem with the tempature door actuator. easy to replace just in tight place. Keep me posted for more help or if this was any help thanks
SOURCE: heater not working, blower not putting out hot air.
There are two other good possibilities.
1) You may have air in the cooling system. A small leak can cause air, or if you've recently had the system drained/flushed or had any hoses replaced, air can get trapped in the system. Some models are equipped with bleed valves, usually on the thermostat housing, which allow the air to be bled out. Other systems can be bled by opening a flush valve or simply by releasing the radiator cap while the engine is cool and waiting.
2) There is a vacuum controlled flap style door that blocks access from the duct work to the heater core. This door remains closed when you have the heat off, are using AC or just plain blowers. It only opens when you select one of the "heating" modes or a mixed heat mode. If the vacuum line is plugged, torn or pinched off, no vacuum can get to that door and open it. Some doors have a cable that opens them, but it is still connected to a vacuum operated lever.
I'd check the vacuum hose first. If that's not it, move to checking your cooling system for air, or have it checked. They are both relatively inexpensive fixes compared to replacing a heater core.
SOURCE: 1998 for taurus heater wont blow hot air only cold
you need to check the blend door in the heater box it maybe broken or stuck.the blend door switches between the heater core and ac evaporator to provide a mix of temperature
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