Ok , i am sure this is a stupid question but are u
Talking about the fan under the bottle compartment
Or is there a fan elsewhere
I see no fan unless those coke polars stole it
Is it in the unit freezing up ?
Yes, The evaporators fan is located in the back of the coils ( the block of ice shown in your case
)
It's between the back wall & the coils, it has to have one, or if not then it has been removed for some stupid reason.
I'd suggest defrosting the poor thong & have a look-see. You'll have to get ambitious & remove the bottom shelf too.