My Kenmore Frostless Freezer runs continuously and does not get below 25 degrees F. I have looked at the coils. About the top 1/2 get frosted the rest do not. Any ideas what may be wrong?

The problem is very common with some freezers.
It has run out of GAS.
It must have a bit of a leak in the gas system.
Get a professional to re-gas it.
Saves you from a big investment in getting a new freezer.