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The problem is most likely with the mode door. This door is under vacuum control and what you are probably seeing is a vacuum leak. It sounds dumb, but most of the time you can find the problem by inspecting the lines under the hood or listening for a hissing noise when the engine is running and following it to the leak. Beyond that, you will need a handheld vacuum pump/gauge to check the system and follow the lines to a leak. You can get the pump for around 30 bucks, or just borrow one from any of the big auto parts stores under their tool loan program. Feel free to follow my user name to my Bio Page and a link to the HeaterTreater web site if you need more info. ford4me.

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Q: Why dos ac and heater blow air through defrost vents and will not blow air into cabin vents on 1998 frod explorer xlt?
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