Hello, I need some advice. I just had my water pump replaced after it failed on me this past weekend. The mechanic who worked on it said I should keep adding water to the radiator to get any air bubbles out. However, he also told me that I needed to buy a gallon of undiluted Dex-Cool AFTER I already bought 2 gallons of prediluted Dex-Cool. Except, he didn't do anything with undiluted gallon. He just broke the seal and left it there so I can't even return it. The resovoir is full BTW. So, what should I do? Also I can smell coolant, should I be worried?