Just curbbed my driver side rear rim today while leaving a parkade

, going to have it repaired tomorrow. In the meantime, would it be ok if i drive on the spare wheel for a few days since the tire's direction is reversed? (I have the 330i SP wheels, and the tires are unidirectional). Should I avoid "spirited" driving?
Since about two weeks ago, I noticed a high pitched whinning noise coming from the front of the car while I lift my foot off the accelerator pedal and let the car move on its own speed. What could it be? A service appointment won't be available till next Friday

, but I would like to know what it could possibly be before I bring it in and let them "hunt around" for the problem.
And lastly, the climate control produces a weird "hissing" sound when its running on a relatively low fan speed. Am I looking at possible aircon failure?
Thanks for any thoughts, suggestions provided!:thumbup: