We have a Chest type Freezer, Model is GLFC1526FW. A lot of ice build up near the top of the freezer. And the freezer lid is cold to the touch. And the bottom part of the freezer, no ice build-up. Is, this normal operation for this type of freezer.

An ice build up around the top of the door aperture isn't unusual due to some cold dense air from inside will spill out when the door is opened to be replaced with humid lighter outside air that will tend to remain at the top for a while.

Being frost free doesn't exclude it from this type of ice build up as only ice formed over the evaporator during a cooling cycle will be melted by the defrost heater.

Persistent localised ice build up could be a sign of failing insulation but this will be marked by a cold spot on the outside of the cabinet.

The dial Adjusts the temperature. If it is adjusted too cold you might have ice build up underneath the freezer thus causing the fluid that you see. As the freezer is old it can also be that the insulation underneath is a bit old causing the ice build up and fluid leakage. A broken thermostat (dial) will also cause too low temperature inside and possible ice build/fluid leakage.

Have a look inside fridge compartment (especially the "roof", if it's a top-mount freezer) & see if you can see any ice build-up (look inside vents that allow cold air into fridge from freezer section. Also, if top-mount freezer, look inside the freezer compartment for ice build-up on "floor", inside vents, or on back wall. These symptoms, combined with water dripping from lots of the "roof" of fridge section (in a top-mount freezer model), can mean several different problems, so best to re-post with more info/symptoms included.
If there's no ice build-up (& the dividing area between fridge & freezer sections isn't particularly cold, which otherwise might indicate hidden ice build-up), it can be as simple as a plugged or obstructed drain tube, which is VERY COMMON. Easiest solution for this latter problem is to use a flexible plastic tube (think similar type as attached to aquarium air pumps), stuff it into drain hole, and blow on the other end. Sometimes you have to blow quite hard to clear an obstruction or complete blockage. If you can't clear the drain tube, it's likely a different problem. Again, a re-post with more info/symptoms will help narrow it down.

These ideas ****. Question was, what causes ice to build up in the chest freezer.

Yes, the freezer temperature means the lid gets very cold. Every time you open it some moisture condenses in the lid and the outside ambient also affects it. The insulation may be beginning to break down and the ice is forming inside. It is not a major problem however and many freezers go on for years with freezing lids!

Very possible the door seal is not properly sealed. Warm inflowing air onto a cold coil will cause ice build up at the lid.

The most likely problem is in the defrost system. Behind the freezer panel there is not only an evaporator fan, but also the evaporator itself, and a defrost heater, termination bi-metal, and drain pan (or trough). You will likely find ice build-up in the evap coil. This could be caused by the defrost timer, the heater, or the termination bi-metal.
Have a service tech look at the unit.

Any freezer without automatic defrosting will build this up over time but a poor gasket seal between lid and chest can accelerate the buildup of frost.
If you want to check the quality of the seal, you could use food coloring (I'd choose green or blue) in water, add a drop of dish detergent and apply this mix to the sealing surface of the chest. Closing the lid gently and then reopening it, you may be able to see if the contact between sealing surfaces is as it should be.
The mixture will wipe off easily with a clean cloth or paper towel. 

if you can't find a replacement, use a piece of flat vinyl siding that goes on houses. You can heat it and bend it as needed, or cut it and screw the pieces to a balsa wood frame for lightweight support. Glue or epoxy probably won't work as the cold temps make them brittle but external caulking may be ok to hold the pieces together. Be sure to sand all edges and corners as the cut plastic can be sharp. If you can disassemble the unit and place the door face down, you can fill the cavity with insulating foam to help stabilize it.

1. check the comp. working touch the top of the comp. 2.if the motor comp. working touch the high side tube of the motor comp. if to hot the freon is ok. 3. check the cooling fan inside.