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I have a 2000 Ford Ranger 2.5 and the A/C vent loses air at the vents and it goes to the defrost when you take off. When you stop it goes back to the vents? Any ideas?

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You have an intake vacuum leak somewhere. Check the engine compartment with the engine idling. Look for a loose or broken vacuum hose or fitting off the intake plenum area and listen for a possible slight hissing sound. Fix the vacuum leak and your vent-switching problem will go away.

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Jim O’Neill
Chino Autotech Inc.

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