Garnishing tax refund

by Grace
(California)

Back in 2008, my ex-husband and I filed the income tax jointly. It appeared that we owed sum amount of money as he was earning 100K++. We got separated in 2009 (the divorce is still in process). Now that I have filed my own income tax return as Head of the Household, will the IRS garnish my own tax refund? To my knowledge, he pays his past debt on time and it worries me 'cause I haven't gotten my refund for three weeks now when I filed it via e-file. Please advice. Thank you