I'm recently experiencing this squeaky noise during startup and it goes away after 3-5 minutes. Does anyone know what's causing it? I have changed the serpentine belt and it still makes this squeaky noise. Thanks in advance for your help.

http://youtu.be/6kZ6jZelzx4

 

That is a serpentine belt my friend. It will take you 20 min and $20 to fix. You can get the belt at Porsche or from Autozone. I went to Autozone.

 

This should help you. Put a socket and ratchet on that green pulley tensioner to relieve the tension. Someone recently did a DIY on this site so do a search to find the step-by-step removing the air box.

 

Thanks!...I try swapping out the belt again.

 

Make sure you clean the pulley's to get any oil off of them. I wonder if the belt slipped during start-up or something. I melted mine one day after washing the engine compartment so perhaps the same thing happened to you when you put a new belt on???

I didn't notice that you already changed the belt but mine made the exact noise so I replaced it. I also took the time to clean everything very well before installing my new belt because I used a little belt dressing and it made everything in its path a little messy. The belt dressing would quiet the belt for a while but wouldn't last. Squirt some belt dressing on it to make sure. If it goes quiet then you know it's the belt but I'm surprised that you need to replace it again.

 

I would check for a loose pulley. There's no reason for a new belt to squeek or wear out quickly unless there is something else wrong. The best should be good for about 50K miles.

 

Also, check all the idler pulleys as well as the tensioner pulley for wear. If you feel grooves alongside where the belt runs across it you may need to stay on top of those and replace as necessary. Found that on my 06 S with 38,000 miles when the first belt detonated.

 

That belt looks fine. The squeak could also be the waterpump going, or worst case scenario, IMSB making noise. Take the belt off and run the car very briefly, if the squeak goes away, its something being driven by the belt. If the squeak remains, then its something more serious.

 

Thanks for all the suggestions guys...turns out it was the belt. I poured some water on the belt while running and the squeaking noise went away. Going to replace it this weekend.