Started losing steering fluid a year ago. Worse in the summer. Finally had to get a new steering rack in May. Still losing fluid. Been back to the mechanic 3 times - he tightened lines several. Am going back again this week. He intends to warranty the part. In all, at least five trips to the shop and loss of car use for those time. Plus the $800 dollar repair. This seems to be a GM problem that they need to address.