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Good morning. So first, there is no vacuum. If the door is sealing up well enough to create a vacuum then that means that the door is actually sealing too well. What happens is that the door closes and the warm air that went inside the freezer/refrigerator condenses and creates a vacuum inside the unit so the door won't want to open.
As for the fan you hear when the door is closed, that is just the circulating fan and that should run almost constantly. The only time it will shut off is when it's in defrost mode or when the door is opened so all the cold air isn't blown out into your kitchen. If this fan is getting noisy then you would want to replace the fan motor.
As for the unit creating the vacuum suction seal, if it's preventing you from re-opening the door, tape a coffee straw segment to one of the upper corners on the door seal. That will allow just a tiny bit of air to come in through the door seal to allow the pressures to equalize better.
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Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?