E46 330i slipping belts

[Robmilford]

Hi, can anyone give me a pointer, I notice that my aux drive belt was making a slipping sound when my car was first started so I changed my belts and the problem went away, but now its back after about 6 months. Thinking that the tensioner pullies were worn and being due for a service I asked the garage to check them and renew if they were no good, but I was told that they were ok. What else could it be, or has he only checked the bearings and not the tension?

Tips please

[BliarOut]

Squeal from cold which gradually diminishes? It'll be the pulley bearings. I bet it's been OK mainly because it's been warmer.

[Robmilford]

Hi thanks, yes thats it, a squeal from cold, I think I'll order a new one.

[Robmilford]

Hi, do you know where I can order a genuine pulley form online

[BliarOut]

Doesn't need to be genuine, I got OEM ones from my local GSF from stock

Note: They've redesigned the tensioner if you do that too, but looking at the one I took off I can't see that wearing.

[Robmilford]

Hi, I have ordered the pulleys and shall be fitting them tomorrow, I'm intreaged about the squeal noise though, I wonder if the pulley is seizing up a bit when cold causing the belt to slip over it and squeal, any thoughts?

[BliarOut]

My take is dry worn bearings. Once friction heats them up what lube is left quietens them down. Spin the old pulley up and you'll know why they squeal straight away

[Robmilford]

Hi, I changed both pulleys this morning, however when I started it from cold the noise was not there, typical. The old pulleys were knackered and it now sounds better, but I'll have to see if its completly cured in the morning.
A couple of tips are, the special tool for removing the viscos fan needs bending as it fouls on a few things and if you can use extra leverage on it and the spanner for the fan nut, as its really tight and a lefthand thread. also the bolts on the fan are in a rectangle not a square so the special tool will only go on one way.