Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 2003 Dodge Caravan 3.3 flex whining sound › 2003 Dodge Caravan 3.3 flex whining sound January 30, 2012 at 11:00 am #438809 dreamer2355Participant I agree with the above posts. However, those serpentine belts on those vehicles can be very tedious to install. I would also check for vacuum leaks. Keep us posted.