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Check the fuses. Depending on the vehicle, the vacuum hose that manuevers the hot/cold flap could be kinked(you can simply hear this by moving it back and forth, if you hear it, you're good), have a hole in it or fallen off, this is more likely if it's blowing actual hot air from the heater core, if it's more like normal outside temperature air you just need an a/c recharge, or something could be wrong with the a/c compressor.
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1989 Grand Marquis AC blows ice cold idling but blows hot while driving but blows cold when decelerating?
it could be the heater core and ac housing unit that allows hot air to be mixed with the cold air or it could just cancel out the cold due to the motion of the car
Ac blows hot air front and back recharged ac and still blows hot air?
One thing to do is to check the A/C Relay. Mine wasn't plugged in once and it did that.
Why does your Ford Taurus blows hot air while ac is on?
Probably because the ac needs to be recharged..
Why ac blows hot air in 2003 Lincoln aviator?
low freon
What is wrong when a 99 ford escort zx2 air condition stops blowing on max ac when you step on the gas but blows fine on regular ac but blows hot air on both settings?
most likely your blend door is broken! so ,your getting hot air from the heater with the a/c on. you will need to fix the heat control unit under the glove box .
Ac light does not come on and blows hot air?
a fuse could be blowed or your ac needs to be charged.(or both)
Why does your central air unit blow cold air for only a few minutes then blows warm air?
why does ac blow warm air? why does ac blow warm air?
Why does your 200 neon ac compressor blows hot air?
Probably low on freon.
Your ac only blows air not cold or hot what is the problem?
Try getting it recharged.
Ac worked the day before now it blows hot air?
check the fuse
How do you fix a 1994 JGC that blows hot air even when on ac setting?
refill the a/c, it will blow hot air with no refrigerant in the vehicle.
Why does the rear ac in 97 Chevy venture blow hot air when the front ac blows cool air?
"http://wiki.answers.com/Q/Why_does_the_rear_ac_in_97_chevy_venture_blow_hot_air_when_the_front_ac_blows_cool_air"
