blower fault?

My blower doesn't seem to work on number 1 and 2 ,seems to blow o.k on 3 and 4 mind you other day no4 seemed to struggle for a second or two but got up to speed and seems to be running as normal since. there also was a squeaky noise from both 3 and 4 ,but that seems to have gone as well.
any ideas of problem and what is best course of action. i.e. does it need sorting straight away or will it be o.k. until I can get my finances sorted. thanks