Hi and welcome to FixYa, I am Kelly
The noise that stops when you open the door is the evaporator fan. If it sounds like blades striking something there is most likely too much ice in the evaporator coils and the fan blades are striking the built up ice. If it sounds like a vibration it can be bad bearings inthe evaporatof fan motor.
Ice build up is usually a sign of an automatic defrost circuit problem. The unit should defrost close to 3 times a day depending on the defrost control installed. What you should do is do a manual defrost session by unplugging the unit, removing the freezer contents and directing a fan into the freezer compartment for just over 2 hours. This will ensure that all of the evaporator coil ice has melted. (Yes it makes a water mess) Tidy things up and return the unit to normal service after your manual defrost session. NOTE: If you have an automatic defrosting problem the fan noise can repeat in as little as 2 days as the ice once again builds up on the evaporator coils.
DO the manual defrost, LISTEN for noise after 24 - 48 hours. No noise... no worries, NOISE after 24 - 48 hours = Defrost problem. Causes of a defrost problem can be the defrost control, defrost heating element, the defrost thermostat or a wiring problem.
Thanks for choosing FixYa,
Kelly
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