On some of the 240's there is a temperature gauge in the lower radiator hose between the radiator and the motor, check if you have one & it may be bad also, That should be a safety backup if the coolant gets too hot it is supposed to kick the electric fan on to help, also if the problem is only when the A/C is on, check and make sure that the electric fan kicks when you turn on the A/C, you could have a bad fuse or relay.
Hope this helps!!
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