Most often mis-diagnosed over-heat w/ac on that chassis is low refrigerant level.
The high side pressure switch on the drier/reciever does not get to cut-in b/c of slightly low refrig, so the car still has a/c operation, but no LOW FAN..this results in passive heat thremal load to radiator . By the time the coolant temp sensor reaches 107 cut-in , it is too late .
The tesy is to jumper the pigtail ends together at the high side sw and see if the low fans come on...if yes , then the low fan circuit is verified....now see if the low fan comes on when a/c has a thernmal loaad on it ...if No, you are low on refirgerant.
If you are in a high ambient climate zone, you can bridge the coolant temp sensor [ blue , 2 wire thermistor one at thermo housing] with a resistor to lower the 105/107 cut-in for high fan to approx 100C..this is a common mod on these dual aux fan seups where one needs the extra airflow.

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A Dalton