I really need some help with this. Does anyone know what this noise could be? Is there a fan near the air intake? I cannot find anything that might be causing the noise, and, of course it isn't always loud when I've got the hood open.

When looking at the engine, it sounds like the noise is coming from below the air filter. Is there some sort of fan down there to draw in air or something? I can't see anything.

I am a new Volvo owner. I'm having a number of problems with my 2001 S40. One of them is a noise from the engine on the driver's side that sounds like a screechy fan or pulley wheel. Mainly I hear it at idle, but it is starting to get worse and I hear it when I drive. Sounds like a fan that is rubbi...

Any suggestions for a next step? Should I replace the MAP sensors?

Hi all, I've found a lot of good info on this site. I appreciate it! I recently purchased a 2001 S40 as a replacement after my last car was wrecked. Unfortunately, after a few days it started to run rough until it is well warmed up (about 5-10 minutes of highway driving). Now, it also has a bad meta...