The whistle only starts after driving several hundred of miles at a time. Also, in extreme hot temperatures. Other (most) times, there is no whustle at all. This has been going on for two years. It is coming from the back of the vehicle. I assume it involves the fuel system, but I don't think it's the fuel pump.
What could be the source of a high-pitch whistle that comes with long trips? on 2006 Dodge Grand Caravan
by lovemyvan83 in Decatur, IL on April 29, 2013
ANSWER by globalhelper on April 29, 2013
very poss the fuel pump itself. have it diag and get est,hard to help without hearing the noise