I have a brand new Carrier a/c 24ACA. It seems to work well, quiet when it turns on and while its running. I'm concerned because often (not every time but most of the time) the unit makes a pretty loud clunking noise as it shuts down. Its pretty annoying as the unit isn't too far from a window in the kitchen. The a/c technician said it was typical of a "scroll compressor"
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<p>There have been many questions asked on <b>FixYa.com</b> about a <b>refrigerator</b> that has a <b>clunking</b> sound from the back of the unit. I will explain what is happening and why it is happening.<br />
<p>The <b>refrigeration system</b> that cools your <b>refrigerator/freezer</b> is run by a motor in a can that is enclosed with a small compressor. This<b> motor/compressor combination</b> is what turns the refrigeration gases back into a <b>high pressure gas</b> and is then cooled to a liquid. This liquid then expands and gets very cold which cools the inside of the box. That is a very simplified view of how a refrigerator works.<br />
<p>Now the motor that runs the <b>compressor</b> has a strong twisting <b>torque</b> (motion) when starting or stopping. To keep the unit quiet when starting and stopping the <b>compressor is mounted on rubber.</b> This allows just a bit of a twisting movement without causing a lot of noise. Sometimes the compressor is just setting down over pins with spring clips to hold it on, and other times they are actually bolted down with rubber bushings between the compressor and the base to cushion the compressor from the base.<br />
<p>Now after many times of starting and stopping a few different things can happen which will cause the starting and stopping motions to make noise.<br />
<p>As with any type of rubber product they can get old, hard and brittle and can crack with age. If this happens the<b> rubber cushioning</b> is gone and the <b>compressor frame</b> is now rubbing directly on the pan or bracket that is holding the compressor. If there are pins or bolts they will soon wear through and break. This will cause even more noise then before. This also will allow the compressor to move enough that the <b>refrigerant lines</b> are in danger of breaking.<br />
<p>Another possibility is that the bracket that holds the compressor or the compressor frame it's self may break and allow the compressor to flop around without any restraint except the<b> refrigeration piping</b> to hold it down. This will cause all kinds of clunking and needs to be fixed as soon as possible.<br />
<p>So the bottom line is that if you are hearing crazy clunking or thunking noises coming from behind your refrigerator, you better pull it out and investigate the causes before you have much bigger problems. The parts to fix many of the problems are available through many appliance repair sites. Look for your model number and then look for the parts you need in the compressor section of the diagrams.<br />
<p><span>How to Buy </span><u><a href="http://www.fixya.com/support/r3907570-buy_appliance_parts_online"><span>Appliance Parts Online</span></a></u>
My CKC was doing the same thing and I thought it was the compressor slamming to a stop. Turns out it was the fan motor. I had a local company replace the motor and the sound is gone. That being said, it has now been replaced by blade vibration.. It just never ends!
The clunking noise you hear , is probably when the compressor shuts off , due to temp reached or when it goes into defrost . An internal motor mount spring , inside the compressor , is broken ( rusted and broke ) . The refrig can go on working for years , without any problem , except noisey , when it cuts off . To stop the noise , replaceing the compressor is the only option . I have heard of placeing objects under 1 leg of the compressor , to " re-adjust " the ballance , but thru my experience , another spring broke , causing more knocking .
it sounds like the compressor insides are loose and you will be needing a new compressor, but just check and make sure the rubber mounting feet on the outer compressor base where its mounted to the refrigerator base are all tight and the rubber shocks are all good
The contactors on each unit were stuck closed. I shut off power to the units for about 2 hours. I went back out and checked and the contactors had released. I re-powered and they started up. Great solution, but didn't really do anything.