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turbo whistle is common as it comes from the tips of the compressor wheel passing through the sound barrier and the turbulence occurs. IN the older trucks you would the turbo whistle as the engine reached full RPM just before a gear change. In smaller engine it is not do noticeable as there is an excess of air pressure that keeps the compressor wheel at a lower rpm and the pressure is dumped out. Turbo compressors reach revolutions in excess of 120.000 rpm under full load If it has just started to make the noise then check the intercooler system for leaks--loose clamps--- splits - Have the turbo compressor checked for damaged fins from the ingress of fine dirt from a bad air filter---check the air filter is not blocked as the turbo speed may result from running in a partial vacuum ( no load on the compressor wheel)
Is it getting cold enough to cycle off. Should be around 10 degrees in the freezer.If the evaporator coils behind the back panel of the freezer
are icing up because of auto defrost failure that will gradually cause it to warm up because ot the blocked air flow.
First to adjust the leveler/wheels you will need to remove the front grill/toe plate. On the left and right sides you should see some bolt heads that are about 1/2" hex head. One on the left adjust the rear leveler/wheel and the other on the left adjust the front leveler/wheel. Turn the hexhead clockwise to raise cabinet higher counterclockwise to lower cabinet. The right side is the same.
Now to your noise, it sounds like you may have pushed the cardboard air dam under the condenser and condenser fan motor near the compressor up into the fan blade area. Carefully follow the source of the sound and you will find what is out of its proper position.
I hope I helped, supertechks