Air conditioning

2003 FORD F-250
157,000 MILES • V8 • 2WD • AUTOMATIC
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RCOLCLEA
  • MEMBER
  • 1 POST
I have a 2003 Ford F-250, when I have the A/C running and increase my Rpms to 2000 or above the air that is blowing through the main vents switches to the defroster vents, why does this happen?
Jun 18, 2011 at 9:27 PM
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DANLESABRE
  • MEMBER
  • 230 POSTS
Is it gas or diesel?
Jun 18, 2011 at 10:40 PM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
Suspect vacuum feed line check valve faulty
Jun 19, 2011 at 1:31 PM
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