Clean cooler fins and make sure the cooling fan comes on and it must get fresh air to run properly if it is in a small room without proper ventilation it will just keep circulating hot air and lastly if all the above are are met it maybe a bad temp sensor and make sure the unit has enough oil and the oil filter is not plugged and the thermo valve (thermostat) is not sticking best way to check this it to take the temp of each oil carrying pipe going into the cooler and the one leaving the cooler and see if there is a difference in temp using a ir temp meter
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