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When the A/C switch is on the A/C seems to go on and off at any given time. When it is working it's fine and ice cold. Some times it work fine for several days and then some days there is a problem. Any ideas on what the problems may be?  

If the compressor does not stay on but seems to cycle and stay off too much it probably is the thermalcontrol amplifier part#27675-9Z000. Courtesy Parts has them 1-800-527-1909.