PLEASE HELP! Abount 2 months ago I had a leak around my temperature sensor so i replaced it and refilled my antifreeze with the dex cool. Now while driving today my low coolant light came on for about 1 minute then went off and about 3 minutes later it went on again and then off. When checking my coolant level there was not much in the radiator and the resevoir was completetely empty? Any suggestion what might be going on? I have a 2001 grand prix se with a 3.8liter v6. Car only has 48,000 miles on it? Also doesn't look like anything is visibly leaking?