About 4 months ago, I had an appliance repair guy out to replace the turntable motor in my microwave. The refrigerator was making the same noise then. He told me to clean off the cooling tubes in the bottom of the refrigerator, and the noise would stop. He told me it was the capacitor next to the compressor. Last week the fridge started making the same noises and it thawed everything out in the freezer. I got online and ordered a new capacitor. It came in 2 days. I replaced the old one and plugged the fridge back in. It works like a champ.