[Obidi]

My MDX 07 started making whistling noise when I made a far journey during Xmas. I tried different mechanics in order solve the problem without success. Just yesterday another mechanic was trying to figure out where the noise was coming, previously some say my tranny is getting bad, some said it's the transfer case. But finally it just happened to be a hose that supply air to engine. It gets compressed once the car is started. It was replaced and the noise disappeared. The hose is just above the engine oil dipstick

 

[Sivryn]

At what speeds did you here the noise? Was it just high speeds or acroos the spectrum.

 

[Obidi]

At what speeds did you here the noise? Was it just high speeds or acroos the spectrum.

Once the car is started, the high pitched whistling begins, but it gradually diminishes and fades out, when the starts speeding, and you slowdown, one could hear it. I would say across all spectrum, but intensity is highest at park