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I also had this issue and it was my radiator was clogged in the cooling fins with cotton from a cooton wood tree and only were the fan and fan shroud meet the radiator clean it with air and a garden hose
The way I do things is try to look for the easy and cheap stuff to fix first. Like I said, recharge it and if that doesn't work try the belt as also said. If it's kicking on and off that can be a sign the pressure is low.