Defective heater blower fan or blower motor resistor, consult manual to locate and replace.
Sounds like the fan is not working. Does it blow air on any setting? If only on high, your resistor is faulty. If not, the motor, switch or fuse/relay may be at fault. Check these out first!!
SOURCE: 2004 kia spectra has blowing air but know heat.
Heat and air conditioning are in separate systems. If you aren't getting heat, the first step is to check your coolant level. Low coolant can result in improper flow through the heater core. If you do have low coolant, be on the lookout for a coolant leak! If your coolant isn't low, then there is going to be an issue with circulation through the heater core. The heater core could be clogged in some way or another.1
SOURCE: I have a 2007 kia
check the fan motor or for trash or debris that could have been sucked up onto the front of the evaporator
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