The thermostat in your car controls the temperature of the fluid entering the heater core. Thermostats have different temperature setting i.e. 195,180 etc. When the rated temperature is approached, the thermostat starts to open up, the fluid path is changed and the temperature of the fluid is held at the rated temperature. If the thermostat opens too soon, or fails to close the heater core will not reach max temperature, and the air from the heater air will be warm,not hot. Also the mechanism that opens the duct door may not work,and the same problem will occur. Also, your core may have a fluid control lever which may not work.
why does ac blow warm air? why does ac blow warm air?
It could be the thermostat on the engine. If the engine does not warm up adequately the heater will never blow hot air.
if the heater does not blow out warm air change the setting.
It appears that it is low on freon. Did you evacuate the system??? Take it to an a/c mechanic. could be the "head unit" or A/c contols in the dash.
low freon or none
It could be that you need coolant or it's low.
heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this
It is probably too old or you could have it on the warm setting. I'm going to have to say, get a new air conditioning. MaDiSoN!!!
I think it will last longer in a warm air because we blow balloons and we have warm air so I think is the warm air.
engine not warm, low coolant, or stuck thermostat
your heater core hoses could be plugged up and not letting much hot anti-freeze into the heater core then when you try to blow alot of air through it it cools the warm air off too much and you get not so warm air. try a cooling sytem flush
The system can be low on refrigerant