I know what you are talking about and this is what students at UC I know usually do in such cases:
Talk with the cashier's/registar's office and see if you have been reported to collections. If you had plans to pay via financial aid, this can be a non-issue, but be sure.
It's critical to remove your record from collections, if any.
Take a loan and find out how the loan will be paid. Most lenders pay the school directly based on what the school bills for the quarter.
If you signed up for X units in Fall '10 and plan to take Y units in Winter '12, add X+Y units in your list of courses. Those X units could be anything in your course catalog.
Once the school sends out the bill and the lender pays it, drop the X units.
This will give you a check and use that to pay out the outstanding amounts.
Most schools will include all outstanding amounts in the bill for your current quarter, but I am not sure if your lenders has agreements otherwise.
Also, some lenders have agreements in place to send refunds directly to them, but remember, the cashier is king and she can make refunds happen the way she likes, and she is likely to help a student unless you have a bad payment history (collections, bounced checks..)