Hi All!

My 2003 S40 has about 2,600 miles on it. Today I drove without the stereo and noticed a peculiar sound. Has anyone else experienced it? I would like to avoid a trip to the dealer if it's normal. The sound: when accelerating at light-part throttle, there is a "whoosh" sound coming from the engine. When I let off the throttle, there is a sound similar to a blowoff valve (a popping, grunting sound).

Thanks for your ideas.

Just got mine back from the the service center for the same problem... It is the A/C drain. Carefull, because they will want to charge you $28.50 to fix it (even under warrenty) I squaked about the charge and they comped it...

Does any one know how to clear the AC drain? I will make a new post as well...

Woosh at partial throttle?? Have you noticed a drop in performance?

Check your air filter box and the intake hoses for loose connections or leaks.

mormit
85 245DL V15cam 242,000mi
02 S40

Thanks Mormit!

The intake connections appear secure.

I had a 2000 S40 that I traded in for this 2003. In both of them, I removed the foam and installed a K&N air filter. I can't really compare performance--in the 2000, I had an IPD exhaust and other goodies which I have not installed in the new one yet. The new one's noise is definitely louder than my older one.

The pipe on the top of the engine from the turbo to the intercooler is metal in the 2003 and was plastic in the 2000. Can this be a cause of a louder turbo noise?