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What make an model an year vehicle do you have ? The air blows out of the floor vents an center vents but not defrost ? Possible mode actuator , stuck mode door ! There is a door inside the heater / A/C assembly that directs the air to the desired position . These doors can be moved by a vacuum operated actuator or an electric motor . Sometimes thing's put on the dash end up inside the heater box , fall through defroster vent ! Pens , pencils etc.. Depends on the make vehicle an system , manual , or automatic climate control . Some of the newer vehicles the HVAC system as it is called , the control panel is a electronic control module an can store DTC'S - diagnostic trouble codes !
the flipper in the dash won't change it to the other vents. maybe worn out. vents could be plugged. there should be something inside your dash that when you press the button or change the setting on the heat diverter it should switch from vent or floor. it's plastic and wears down or maybe jumped the flipper thing to move the heat thru the vent system
had this problem on a ford crown vic ... tried the switches that control the vents not it ... turned out that one of the vent doors inside of heating and ac/ ducts was broke .... had to take the whole dash apart to fix ... u need to have it checked by a respectible mechanic ... depends on ur yr and make of car on how to diagnose problem ...
I had a problem with that in January 2008, my thermostat was fine. I took my car in to the dealer and they said the hinge that opens and closes the hot/cold air inside the dash broke. They had to remove my entire dash and replace the part. Luckily I was under warranty and didn't have to pay but the repair would have cost $3000.
I'm not an expert, but I took my 2000 Lincoln Nav to the shop and they told me the issue is that my accuator is not opening properly to allow the heat to go through; therefore, it's overheating. That's why I can feel some heat on the front in the back. All vents, including the rear vent blows strong, but they blow very cold.
Unfortunately, I'm also having an issue with my engine intake manifold or intake gasket being cracked causing anti-freeze to leak out of my tailpipe and smell badly through the vents - even on defrost - so until that's fixed, I'll never have heat.
check the 2 cold vents see if they r blowing out less on high than the other. check ur vent hoses between the vents it might be disconnected and only sucking in cold air. that will get u started on a sollution. some vehicles vent hoses tend to run out side the fire wall in the engine compartment.