Ok there's a evaporator fan in the back inside the freezer, had this same problem, its easy to get to, change it and problem solved. had the same problem freezer was only 3 years old, easy to get to easy to fix.
The first thing I would do is clean the external coils. They will be underneath or at the back of your unit. Since yours is so old there may be a buildup of dust and gunk on the coils. If the coils cannot release heat, then the system will not work properly. To clean, you may have to remove an access panel or two. You can use a long handled brush and/or a vacuum with an appropriate attachment. There is a fan located near these coils. It functions to circulate air over the coils and compressor. Built up dust and debris around the fan may be causing the noise. Keeping the coils clean is a simple way to help improve performance of your freezer.
Check the RepairClinic site, as they indicate what may be wrong when there is a 'rattling' noise in a freezer
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