yes but why would you leave it loose?
ur car sucks!!!!
this is normal and nothing to worry about. Almost all vehicles make a whining noise in reverse Ford Mondeo's sound the same reversing as they do going forwards no whining also VW Passatt i think the Golf's are the same also maybe modern technology has improved this. probably bad enough listening to your wife whining you can do without your car doing it.
wheel bearing, gearbox or wind noise Supercharger?
Check the power steering fluid level. It might just be low or there is a leak.
Going to the garage to get new brakes before you gear box goes
Car wheels on the pavement.
Normally a whining noise in the back end means the differential is shot
This is normal.
It could be a number of things ... heres a list of things you might have to look into.. #1 belt needs changing #2 alternator #3 crankshaft pulley ...those are the main three things that will or can make your car make that annoying noise...
Loose washer
The whining could be related to the alternator. Does the car have any electrical problems such as the battery drains and dies while car running, are your belt(s) tight? in good condition? It might be a belt tensioner or idler pulley that is causing the whining.