If the fan motor makes a loud squeeling noise or huming noise its going out and it wil affect the idle.
This is impossible to tell without seeing the vehicle, but check to be sure your sepentine belt is still intact and turning the alternater and the water pump. I've seen these go out b4, and these symptoms seem consistent with the belt not driving it's components, overheating (the water pump not being turned) and lack of electrical poiwer( the alternater not being turned). Good luck and contact me if you are still having problems. We will try our best to help you solve this!
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