Once a valid lien is placed on a bank account, it is frozen. The bank is not allowed to let any money out of that account. This means that any checks written on the account that are still outstanding...
Generally, your bank assets are frozen until you make arrangements to pay the amount you owe for arrearages.
If you have a judgment, you can work with your attorney to craft a lien on a bank account for no more than the judgment amount.
Go to the bank and talk to a bank officer or customer service representative.