Lately when I start my Jeep, it makes a whining sound when cold (20*F ish.. plus a cold engine). I first thought it was the PS pump, but its the wrong side of the engine (the fluid is full btw). My next guess would be the alternator or tensioner pulley. (It's definitely not the driver.. He makes more of a loud whine when cold. ) The sound always goes away once warm. I guess a good start would be to take the belt off and run the engine to check for noise. Maybe give the pulleys a quick spin to check for vibration too? Anyone have any suggestions? Thanks guys!