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if you have not already, you need to have your freon checked. It sounds like you have a leak in the system.

or

it could be...you have an ambient air temperature sensor normally located just under the front of the bumper in front of either your left or right foot well. if you've ever knocked or scraped the front bumper(even some shredded tyre on the motorway flicking up) from the underneath, this can break this temperature sensor and make your electrical management unit believe that its either extremely hot or extremely cold outside and it will blow out the opposite temperature regardless of what you choose.. you can buy replacements for around £20-50 replace yourself. hope this helps

or

More than likely your problem is the blender door. The blender door is a flap in the heater box that controls the temperature of airflow in your vehicle depending on where the temperature dial is set. It is a VERY common problem with newer trucks. The blender door has a geared component that strips out, or sometimes even breaks off. The door will need to be replaced with a new stock one or a modified one. I have the exact same problem in my 99 f150

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โˆ™ 2011-03-13 16:42:39
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Q: Why would a 99 F150 V6 heater/AC blow hot air no matter what the setting on the temperature control says?
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