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Old 11-02-2013, 09:10 PM   #1
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Default 1999 F150 ac gives heat in summer and heater gives cold in winter

Hello,

In my 1999, 4.6L V8 F150, when I turned on the AC this past summer, I got heat regardless of the setting, and now in the winter, when I set the temperature to heat I get cold air. I get some hot air only when I place the control **** on "PANEL".

Any Ideas of where to start checking?

Thanks.
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Old 11-02-2013, 09:51 PM   #2
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Quote:
Originally Posted by useroff150 View Post
Hello,

In my 1999, 4.6L V8 F150, when I turned on the AC this past summer, I got heat regardless of the setting, and now in the winter, when I set the temperature to heat I get cold air. I get some hot air only when I place the control **** on "PANEL".

Any Ideas of where to start checking?

Thanks.
+1 on any ideas. Mine is a 2000, 4.6L V8 F150 Manual, essentially the same vehicle. My AC is not working either. Any ideas would be appreciated as well.

Jack
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Old 11-03-2013, 10:17 AM   #3
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The most common failure on both trucks is the "Blendoor" in the A/C-Heater box. I would check the actuator for this door under the dash, first. If it works then the door is broken at the pivot shaft. Here's the bad news, complete removal of the dashboard is required to fix this issue. I did mine last year and it took about 12 hours in/out. There's a great U-Tube video on this repair "realfixesrealfast/f150 heater core"
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Old 11-03-2013, 11:56 AM   #4
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+1 on the blend door. Likely stuck, or maybe even wired in wrong.
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Old 11-03-2013, 02:08 PM   #5
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Could also be the blend door motor, they fail quite nicely, sometimes they stop working, sometimes it's like the polarity got reversed...easy fix though if it's just the motor.
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Old 11-03-2013, 02:08 PM
 
 
 
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