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<P>never had a sound before ( in 20 years) but after A compressor change the evaporator makes thei sound all during the cooling cycle.</P>
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<P>At 100F outdoor air temp I get 59F at the regiester nearest ( about 5 feet) to the evaporator. At 100 F the condenser temp rise is about 20F it is a 4 ton split  R22 system</P>
 
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