a dampner... thanks. But the tech said that the belt didnt seem loose enough to cause the compressor to turn off. How loose should it be..? Still the compressor turns off ofter a 1/4 second.before it would last 15 min then all of a sudden it was 5 minutes then 1/4 sec. Is there a relay or something or is the compressor is bad? How loose does the belt have to be?