came home from vacation and my amana frig was barely cool. had a tech out to the house and said it was the defrost timer and wanted 300 to fix it. i said no and bought the timer for 20 and replaced it. but when i turned the power back on to the fridge the light is on inside but i hear no motor running still. the other morning i did hear the motor running before i went to work and it was kind of cool inside but not cold...any ideas?