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Have you filled the radiator or just the reservoir tank. The sensor in the radiator top tank requires water for it to complete the circuit to keep the light out. No water and the circuit is broken so the light comes on. The same will happen it he wire to the sensor has broken off. If all ok then reset with a code reader
Engines do not produce humming noises.... more likely a worn bearing from a pulley.
Have your Alternator tested it may be under stess and not working properly thus giving a humming noise.
All the best.
check any visual oil leaking from differential, if oil mark there check diff oil and adjust or replace oil, then get it for drive, if the problem same as before check rear wheel bearings.if no noise from wheel bearings possibly faulty transmission get it diagnose by transmission experts what's the fault in trans mission, is this information helped you?
THE HUMMING NOISE IS YOUR SECONDARY AIR INJECTION PUMP. THEY TEND TO BE NOISEY AT START-UP. IF IT IS NOT WORKING COREECTLY IT WILL SET A CHECK ENIGNE LITE. THE CLICKING NOISE IS NORMAL IF IT GOES AWAY AFTER WARM-UP. THESE MOTORS ARE NOISEY WARMING UP DUE TO THE HYDRAULIC LIFTERS.
There are no speakers attached but if for any reason humming is comming its the transformer inside the casing. Very comming in transformers that after some time they start humming noise.Its not for all of them but its some coiling fault but it doesn't effect anything.