I have a 2005 Kia Spectra ex. Had mechanic look at it twice. Had battery alternator and starter tested. All good. Check engine light is not on. Just had tune up trasmission fluid exchange done. The power steering hose needs to be replaced so says the mechanic. Now I am still hearing a weird ringing noise in the engine and an electronic gurgling noise and as of recent on occassion a chattering noise. What could it be?

The ringing noise could be from a bad alternator, a loose bolt, a loose pulley or gear or possibly a low fluid level in the power steering pump. Try listening for the noise when the engine is idling, then as you rev the motor from 1000 to 1800rpm and also while you are driving on the street and the highway. While the car is in park and running, crank the steering wheel right and/or left until it stops and hold it there to listen for noises from the power steering. The electronic gurgling noise and chattering noises could be failing bearings in one of the pulleys (tensioner, idler,etc. and/or possibly a water pump bearing. Here is a tip for diagnosis- Find 3/8 drive extension that is at least 12" to 18" long. Open the hood and start the car. Take one end of the extension and place it on the alternator body away from any electrical connections, pulleys, belts, etc. and put your ear against the other end and listen for chattering, ringing or any other odd noise. Then do the same to the p/s pump, a/c compressor, etc. BE SURE YOU SAFELY APPLY THIS TECHNIC AND IF YOU DON'T FEEL COMFORTABLE, TAKE IT TO A PROFESSIONAL. SAFETY FIRST.