99% sure it's the idler pulley, I have went through two oem
ones and the asp pulley is much better. you can purchase just the idler it's 150 a pop or like 325 for the set of three. it's not on thier site so you have to call them

 

Its $125 from ASP for the one, or 350 for the 3 like you said...

 

haha I had the prices messed up. that should fix it though.

 

Just bought a stethoscope to see if I can chase down the squealing noise I have going on. Wifey saw them and said is that for playing doctor?

 

LOL

 

Idler pulley bro. Call James or Peter @ ACG and get yourself a full set of ASP Goodness. Took care of all the squeaks my 55k was having and they look incredible.

You can always just change out the bearing too if you have a press handy. They are like $5 on ebay.

https://mbworld.org/forums/w211-amg/...ng-repair.html

 

So I took the SC belt off today and the squealing is still there. Still cant seem to pin point where the fawk the noise coming from. The 3 asp pullies, will fix this 100%?

 

If the SC belt is off and you still here it then that eliminates 2 asp pulleys (tensioner and front idler pulleys) which are on that circuit so it leaves the rear idler pulley. I say do the screw driver test on that 3rd combo pulley. Serpentine belt is good though right? From Vazha's photo with the arrows, the pulley I'm talking about would be the one closer to the engine. If the sound isn't from that one then the ASP pulley kit is not your solution to this problem.

 

not sure if you saw my earlier post.
Check the water pump pulley seal.
It squeals on mine until the car warms up.

 

Rear idler 1 or 2 pullies? Which one is it? How do you do the screw driver test lol. I havent change the serpentine belt since I bought the car... approx 13,000 miles ago...

Where is the water pump pulley, did you fix the issue?

 

front bottom right hand side of the motor.

It's one of the first signs that the water pump is wearing, but because I don't have any leaking or wobble I just live with the squeal.

At least it may point you in the right direction, if it's not the pullies.

 

Thanks man, I don't see wobble or leak, sound does go away after the initial cold start so maybe the same situation as yours llol

 

Try spraying a little bit of wd-40 on the serpentine belt for kicks. It takes 2 seconds and it will tell you if its the belt or not.

 

Seriously? lol Will try that...

 

I'm serious I thought for sure I had a bad idler pulley, replaced the bearing and everything. Then I figured I had some other pulley that was bad. I had the car at MB for something else and asked them to take a look and they said it was my belt and they would change it for like $350 haha. So I said no, took the car home and got some wd40 and gave it a little squirt on the belt and the squeak disappeared.. So I replaced the belt myself and it never came back

 

The Goodyear Gatorback belts grip better than any other belt on the market and they are very quiet.