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 19, 2011 at 4:27 AM
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DANLESABRE
  • MEMBER
  • 230 POSTS
Is it gas or diesel?
Jun 19, 2011 at 5:40 AM
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DOCFIXIT
  • ✓ASE Certified Mechanic
  • 18,828 POSTS
  • ASE Certified Mechanic
Suspect vacuum feed line check valve faulty
Jun 19, 2011 at 8:31 PM
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