1999 S70 AWD,. A few months ago had the reservoir for fluid changed. The one that is on the passenger side closest to the firewall. Shortly after that my son said he was getting a noise like it was coming from the passenger side. I did hear it once and it sounds like something loose or fluttering from air. Although Ill confess noise problems and my hearing do not go well together. I took it back to the dealer who said he could not hear anything. I have driven it a few times since then and did not ear anything either. Tonight I used the car and it started when I was on the parkway. I realized that the car has to be going over 50 before the sound starts. Any thoughts on what it could be? Thanks for any replys.

 

Not a clue. If it is running well, don't worry about it. Other than that you can look for something loose.

 

my pass. side mudflap is a little loose, and sometimes makes a little noise, over bumps or wind, it can get quite annoying, and all it takes is the right kind of rivet. just my $.02

 

I was thinking something simular. Maybe the side moding or something. Something that high speed winds can vibrate.

 

I took it in and they said it was likely coming from the dash or heater box?? They didnt charge me ffor that but said they would need like 2 hours to further find out where and what it is at 134 and hour