when accelerating the a/c stopsblowing out of the main vents and is diverted to the defrost vents. what is making the vents do this?

Asked by Jun 21, 2014 at 01:17 PM about the 2002 Ford E-Series Cargo E-250

Question type: Maintenance & Repair

3 Answers

101,715

Possibly a Vacuum leak if your damper doors are controlled by vacuum.

6 out of 6 people think this is helpful.
101,715

http://www.ford-trucks.com/forums/1077168-a-c-blower-defaulting-to-the- defrosters.html -- check this out. It will explain how to fix this for you. Hope this helps

18 out of 18 people think this is helpful.
143,325

Absolutely a vacuum issue. dandyoun is right. When you accelerate the manifold vacuum drops to a point that the HVAC gets 'confused'

5 out of 5 people think this is helpful.

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