I beileve the fan that blow the air on the inside of the compartment stops running more often than the compressor. The fan on the back side runs all the time. The air which blows out does not feel real cold. The lowest the inside temperature has gotten is 62 degrees. The compressor is vibrating slightly, I am not sure how hard it is suppose to vibrate but I can feel it slightly. It gets pretty hot to the touch. It just does not appear to be cooloing the air enough. What do you think?