I got my car in October, and after the first snow, whenever i have my heater on, there is a loud squealing noise. I've determined that it's the serpentine belt. I bought some belt spray, which did not solve the problem. My dad says the belt felt kinda loose. How do I tighten the belt? I'm taking it to the dealer on Wednesday to just have them look at it. I'd prefer not to pay $100+ to have them tighten a bolt.