Addition to the Main Relay and A/C CCU board, one of the common failure item is the cooling fan control unit.
Not only it controls the radiator fan but also it controls the A/C system. If your radiator fan or A/C condensor fans operate intermittently or didn't operate at all, you need to consider the failure of this device as well.
Mine was fine but as a precaution, I replaced it recently.
It seemed that it switches on and off the radiator fan more frequently than before but it could be just my feelings....
Kaz
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