Probably a bad thermostat.
A radiator fan is used to help cool the engine by blowing air across the radiator, which dissipates the heat generated by the engine. This prevents the engine from overheating during operation.
Ask this question again. Is the question no blowing or blowing cold?
Replace Thermostat
What do you mean by "has no heat"? No air blowing out, blowing out cold air when heater is on, blowing nothing at all? Heater not turning on? What specifically is happening?
As long as the engine is not overheating, this is normal for a radiator to do. The heat comes from the engine on the driver's side, and exits to the engine on the lower passenger side.
Check the radiator for full coolant. Check the engines water pump and thermostat, as the engine coolant carries heat from the engine into the heater core.
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This is probably the furnace overheating. Usually overheating happens when the filter is too dirty and restricts airflow, causing the limit switch to shut off the burner.
Most likely the engines thermostat is stuck closed. Probably low coolant level. No flow, no heat. Now where did the coolant go ??
if car is blowing cold air, you need to check the thermostat,the heater core, and the heat control. the coolant will not blow cold air unless there is no coolant at all in engine,then you have bigger problem anyway
What you do is take it to a trusted mechanic and have them determine why it is overheating. Can be defective cooling fan, thermal relay, stuck thermostat, clogged radiator, or much more serious, a blown head gasket. DO NOT keep driving this car in this condition.
It can, yes. The water pumps most critical function is to pumps water around the engine and control how heat is dispersed through the engine cooling system - keeping the engine from overheating. In most modern vehicles it also forces heated air to the heater core. If the heater is blowing cold air, it could be due the failure of the water pump.