[Carl n Susan]

Most likely you have a thermistor problem. It cools but not very much implies the guts work but are shutting down prematurely. The thermistor monitors the inside temp. It clips on the cooling fins. Moving it up (North) makes things colder. Moving down (south) makes things warmer. Check that it is clipped onto the fins and towards the top. If it is, a replacement is relatively inexpensive and easy to install.