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When accelerating the fan motor seems to get weaker; and, when I let off the gas, the A/C blows colder air.
Maybe some sort of vacuum leak, that gets worse when the engine revs higher? (keep in mind, my list of tools begins and ends with a screwdriver).
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Not a bad guess actually, if the blend doors are operated by a vacuum system (which they are in a 2006 Escape) . Acceleration drops vacuum, air door shuts down air flow from the fan; let off gas, vacuum increases, air door opens lets in more cold air from AC (or heater as the case may be).
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