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I would suggest a coolant flush and Thermostat replacement if your overheating. If you havent flushed your heater core you should do that too, flushing each seperately with water can get alot of crap out.
Humming around the head/belts. Check your bearing on the pullies, remove the belts and psin each one seeing if they make noise. You can also try lubricating the pulleys with the belts on, run for a few minutes let the grease work in and see if that gets rid of any bearing noise.
it could be something else too, just giving idears
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