Hey all! I have a question and i am hoping for an understanding. The other day when it was 80 degrees out I turned my A/C on and suddenly my trucks fan sounded like a Septa Bus. The fan got extremely loud and then a couple mins. later it stopped. then i was sitting in traffic and when i began to pull away it did it again. It sounds like when one of the boost tubes comes off but i coming from the fan. I checked all my lines they are all tight. Is this noise normal? i was told its the clutch in the fan fully engaging. Please Help!!