Usually that is a sign that there is a blockage to the condenser fan below the cooler. See if the condenser is dirty, or something blocking the flow of hot air from the condenser fan area. Check
the condenser fan motor to insure it is healthy and running strong. Recommend cleaning condenser to allow air to circulate the area freely. If fan is slow, stopping or not running I recommend replacing the fan motor. Sea Breeze
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If the coller does not have a fan for condenser then for some reason the cooler is working too hard could be that the door is not closing. On many coolers it is normal for the exterior surface to heat up because that is how it transfers heat from the inside to the outside. Thanks John T
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