My chest freezer recently beginonly freezez a little at the top but it 's just cool like a fridge at the bottom

Hi and welcome to FixYa. I am Kelly. This freezer uses the chassis to dissipate heat so that the freezer can freeze. There is not a condenser fan. So what you have is a basic and usually trouble free freezer. If your freezer is not cold at the bottom of the unit there can be a couple of causes:

1. The compressor is running slow due to the rotor dragging on the compressor stator.

2. The PTC relay contacts on the compressor are getting hot and the compressor is shutting off before the temp control cycles the compressor off. Usually that is how PTC relays fail.. one hot contact and the unit cycles much more rapidly than usual and eventually the compressor stops running completely.

3. The system Freon has leaked out of the system and the unit is running on low pressure. (If this is the case the symptom will only get worse and very soon)

4. There is a very remote possibility of the cold control being damaged from an external bump by someone due to the fact that it is located outside the freezer compartment on the chassis.

Thanks for choosing FixYa. Kelly