I have the same problem. I own a 2000 Grand Caravan 3.8L. Bought it last September used with 52500km. Took it in for the first scheduled service maintenance and told the service manager about the problem. he said that they would check it out.The belt would screech at start-up when the engine is cold, but would stop when the engine warms up.When i got the vehicle back the report stated that the noise is normal "due to air moisture".This is the first time i have ever heard such crap. I have owned Japanese made vehicles before and never had this complaint.