digiras

Hello, I purchased a 2009 ML63 with 45k miles about a month 1/2 ago that Ive only driven 3 or 4 times. Do to a very annoying whizzing like sound coming from the engine once it heats up. It was wrongly diagnosed as a few bad pulleys and belt. Next WRONG diagnosis was Harmonic balancer which took over a month to get from MB Germany because there was none in the states so they actually had to make me one.. So here I am now with All new pulleys and belts and a new Harmonic balancer and the Damn car still is making the Sound and the Mechanics are Stumped.... Help Please!!!

zenman63

Make a video and post a youtube link

MBist

Are you sure is the pulley not the power steering reservoir or pump? That's very common on ML63, happened to my 07....sold it more than a year ago replaced it with X5 and replaced to FX50s. Germans auto are great to drive no doubt but they are super finicky ...got no time to deal with all these so I got myself into a Japanese, and this is my third Infiniti . Good luck

AwdthisC63

Assuming since the mechanic replaced the pulleys the noise is in that area. Run vehicle with belt off and see if noise is still present. Could be component like steering pump, alternator, etc. pcv valve/hose are also know to make noise as well as front transmission pump. Going off of whizzing noise like you stated

AKnight55

Post in the e63 forum you will get more responses