Danby Silhouette DWC513BLS lower back fan noise.

fan usually mounted if back panel of freezer check inside

The problem with the factory fan is that it is a sleeve-bearing fan. On average, a fan should operate for about 50,000 hours, which if it runs continuously would be over five years. However when the operating temperature rises or the fan is installed "not exactly" vertically, it will have shorter life.
I had to replace my fan two times withing two years since we bought the unit! Plus the stock fan becomes quite noisy after a couple of months of work.
With all of these problems I did some research for better fans and decided to purchase a ball-bearing fan to install it into the cooler by myself.
Ball-bearing fans on average outlast sleeve-bearing fans by 50 percent and produce less noise.
It's very important to purchase the right AC 115 Volts fan for this Danby wine cooler.
The original fan is Rullian Science RAL 1225S2 (120x120x25 mm in size, 100-125V AC, 0.09A)
The replacement model is Orion OA12AP-11-3TB which I got for $16.75 from Mouser Electronics (mouser.com). The replacement model is ball-bearing cooling fan with slightly higher/better parameters, which will help to cool down the wine cooler coil faster.
To replace the fan you need to tilt the wine cooler on the side and unscrew two small screws at the bottom that keep the original fan in place, remove one screw to the black box where the fan wires are attached and unplug these wires. Then you just need to replace it with the new fan and test that it works properly. If you never used Soldering Tool before you probably will be better off with getting some help from certified electrician - it still will be less expensive than getting this fan ordered every year from Danby.

I had the same problem on my DWC513BLS wine cooler (12 years after your original post). I fixed mine after much troubleshooting. If someone have a similar problem, here are the error codes for that unit :

E4 = Defrost sensor defect
E3 = Defrost sensor disconnected
E1 = Lower chamber sensor disconnected
E2 = Lower chamber sensor defect
E7 = Upper chamber sensor disconnected
E8 =Upper chamber sensor defect

To correct E4, I had to replace the defrost sensor with part #DWC276.

As I have worked on a few ELECTROLUX wine coolers and they do not have a cooling fan for the inside of the unit are you speaking of the one under and in back of your cooler if so then it is a condenser fan motor it will be 110v and your local appliance store should be able to order one close enough to work in design and rotation of it. Hope this helps.

change digital board in the front

i got the same model,the noise from the lower back,u can remove the fan out & determine the noise from easy,the bottom have two bolts,easy to remove it.gd luck for u

Before you worry about where to get parts,you need to know what is wrong and what parts you will need. When a compressor does not run but the fan motor does, then either the compessor is bad (in which case you need refrigeration expertise) or the starter components have failed ( in which case you can replace. The two most common failed parts are the start relay or the overload (both attached to the compressor. Goodluck, Macgivor

The upper fan is mounted to a board inside the refrigerator near the back. To access it, you have to remove all of the shelves completely. Once you do that, you should be able to see the screws that hold the backing in place. Remove all of those, and pull the board out. The fan is mounted directly to the board.

When you replace the fan, I suggest you use rubber washers or grommets when you mount the new fan to the board. That will dampen the vibrations that otherwise are amplified by the board itself.

http://www.adrianmccarthy.com/blog/?p=79

Had same problem. cooling fan was going out.Replaced fan about a year ago and now it is going out again. Am ordering another fan now

The problem is likely with one of the two fans. A new fan is available from Danby (1-800-263-2629). My noisy fan is the condensor fan located at the bottom rear of the device. After removing the cooler from under the cabinet, the source of the noise was obvious. You will need to tell them whether it is the upper fan or lower fan. Leave the cooler upright for a few hours before you plug it in so that you do not damage the condenser. Price for the fan from Danby is $20.15 including shipping. Users Manual is available at http://www.danby.com/manuals/DWC512BL.pdf -Ron