I've noticed the last couple of days the power steering makes a whining noise when i turn the wheel ('98 Fiesta) - I only seem to notice it at low revs or when idling (seems to be louder the lower the revs). I always noticed some noise from it when idle but it apparently got worse yesterday.
Could it be anything to do with the cold weather? I tried to check the fluid levels - there seems to be something in there, however there's min/max markings on what's apparently not transparent plastic so I don't know if it's too low or what. Haven't noticed any leaks. The auxiliary belt looks kinda cracked and brittle - could it be that?