The suction noise is not something that will happen all the time.
check the current draw on the compressor and make sure it is in between 1.2 and 1.6 amps.also look at you evaporator coils and make sure there is no excessive frost build up.If there is ice build up then you need to defrost it check the heating element and defrost timer and make sure they are in proper working order.also check the evaporator fan and make sure it is working when the unit is in a cooling mode.
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