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Ford escape 2009 driving on highways and shaking going uphill 75mph or sometimes shaking going 75mph no matter what and I also notice when it happens that my air conditioning seems to not work at 100% compacity. Once the car stops shaking, my ac kicks back up and goes 100% back full compacity. What is this? Thanks!
 

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If it were just the shaking at ertain speeds, I'd say wheel balance, bt that doesn't explain the AC. Are there any warning lights when this happens? Possibly codes being thrown?
 

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Could check alternator output in case it is overcharging / undercharging when loaded and throwing out electrics affecting engine . That is if it is an engine fault and not as suggested a possible wheel balance / vibration related fault .But usually wheel balance would kick in earlier and you often can drive through it . Could check engine , trans mounts and check for any excessive movement at wheels .
 
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