[bill]

Our newest addition to the Mopar fleet has made a weird 'whistle' from day one. At above 55mph a high pitch whistle is heard. The loudness of the whistle corresponds to the engine rpm. For example, cruising at 65mph the whistle is high pitched and constant. I let off the accelerator and the tone of the whistle lowers alittle as does the loudness. I would say it is coming from the front dashboard, driver's side. But with the acoustics of the cabin it is hard to really determine. With the radio on it cannot be heard. But alittle annoying while quiet.
The van has 73K miles.
I'm thinking this is a needle in the haystack but thought maybe someone else out there has had the same issue? Thanks

 

[bill]

Thanks for the great ideas everyone. Since the 'loudness' of the whistle directly correlates with the engine rpm above 55mph I'm thinking a vacuum leak?. Next time out I'm going to try depressing the brake pedal slightly to see if that affects the 'whistle'. Great thinking ImperialCrown!

 

[bill]

I had the van on the interstate yesterday and unfortunately it's not a brake vacuum issue. It sounds more like a high pitched electrical whine/whistle. I turned on/off every switch but that didn't affect anything. It's the oddest thing. The high pitch always stays the same but the 'loundness' varies with the engine rpm. Any ideas? Remember the alternator feedback you'd get on the am radio's back in the day....?...

 

[bill]

Thank you ImperialCrown. I'll have to get an assistant and do some investigative work.