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2009 Ford Expedition Questions

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i have detewrmained my compressor has failed i want to change it but i also want to change accumulator
While under heavy acceleration at about 30-40MPH there is a distinct poping sound eminating from the dash. It sounds like a vacuum valve closing. It has been back to the dealer 3X's and they have been uable to duplicate the proplem. As soon as I pick it up and drive it away it will continue making the sound. No operation problems as a result more of an annoyance. Any suggestions what might be causing the noise?
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