Keith,
The fan for your ULine icemaker is located at the rear of the area under the unit, on the right side. It draws air in, over the condenser coils on the right side, and since it is in an enclosed area, the air exhaust out the left side. All of the excess heat should be coming out the left side (your left as you face the unit). There are two things that can cause overheating and poor performance in ice production. One is a condenser coil that is clogged with lint, dust, or pet hair. The other problem that can cause this condition is an underperforming or inoperative condenser fan. Either factor will cause poor ice production an the tendency for ice in the bottom and rear of the ice bucket to melt into a block.
The only cooling in a ULine ice maker is the area around the ice tray, and as such it is normal for some of the bottom and rear ice to melt and form a block in hot weather, but if ice production is very low and melting is excessive, you need to address the air flow issue.
Gerald