If the engine is overheated by the activation of the air conditioner on Mitsubishi Padero 3, the cooling fan needs to be checked in the first place. If the fan is OK, then we should try to wash the radiator from the dirt. It is not possible to use high pressure soaks for washing, as the water jet may consume the hundredth of the radiator.
Another cause of the malfunction may be a freon leak from the system. In this case, it is necessary to find and correct the leak as soon as possible, as it will eventually lead to costly repairs to the air conditioning system.