Hey guys, so the aftermarket shift **** has obviously become a backburner to this. My 2004 Volvo S60 2.5T has developed a squealing/whistling condition from somewhere in the lower engine bay. If you're in the car you cannot hear the noise (unless you listen super closely or you're accelerating hard at which point it sounds like it's supercharged lmao), but if you're in front of the car it's super loud at idle or when coasting. It happens 9/10 times when the car gets up to temperature and runs for a while. Otherwise no sound upon initial cold startup. RPMs on cold start are normal (starting at 1.5k rpm to get oil flowing and initial warmup and slowly lowering to normal idle) and driving rpms seem normal, however boost seems down substantially (new TCV already ordered from FCP Euro and on the way as the one in my car is the original and they tend to fail). Thought it could be PCV Breather Box or accompanying gasket, but upon further research these year of cars have an oil catch? Only other thing I could think of is a vacuum/turbo line leak. Need help with this one!

 

Sounds too high pitched to be caused by too much vacuum in the crankcase - but have you tried removing the dipstick to see if the noise stops?

 

I will try the dip stick solution this evening after the engine is warmed up and let you know the results.

 

tried the dipstick method no luck. any other ideas on what this could be?

 

the fact that you notice after the engine is warm suggests a component is expanding and allowing some form of an air leak. have you tried spraying around with some carb cleaner or misting with water / inspected hoses (like the places the boost tubing meets the turbo on through the intercooler and back to the throttle body)? sounds like you're on the right path suspecting some loss of boost is tied to the sound.

 

It is rainy and nasty today, as soon as I get a nice day I will try that carb cleaner trick mt6127. Thanks for the suggestion.

 

Did all the carb cleaner testing, no leaks. Noise seems to be on right side of car around the belts. Given the nature of the noise idk if it's Alternator whine or a bearing going. Neither is cheap. At least the TCV was lol.

 

Still cannot absolutely pinpoint what this is and it's super annoying. I don't have the time to take the car to a mechanic or a Volvo specialist anytime soon and was hoping this was a hose I could replace but it's definitely coming from somewhere around the alternator/belts general area. I'm just as confused as most of you probably are.

 

The plot thickens folks. So the car is now idling with an intermittent stutter, leading to me to believe once again that it's a vacuum leak somewhere, anybody have any ideas what vacuum tubes might be running near the right side ("front" since the engine is mounted transverse) of the engine in the engine bay? Tried some carb cleaner but it's hard to get in there.

 

As of today I have figured out this is something to do with the power steering, oddly. If I turn the steering wheel all the way it sputters the engine and the whistle gets louder. Any ideas what I'm dealing with here?

 

Hello there;
I just joined to forum.
I have a Volvo s60 2.0T 2009 model car.
While reviewing the topics on the forum. I have read your correspondence. Sorry, my english is not very good. So I hope you can understand what I wrote.
There is a possibility that the problem may be with the v-belt.
My first vehicle was S60 2.0T 2002 model, I had a similar problem. Sounds like I heard it.
The sound gets louder as the car warms up.
If the problem is in the v-belt; While the car is running, pour water over the v-belt. it will mute the sound. however, the sound will start again when the water on the belt evaporates and dries.
If the sound does not stop even though you pour water, it is in one of the parts that the v-belt turns.
I leave a video below. Regarding the problem I mentioned.
I hope your problem is solved.

 

Thanks so much!!!! Will try this!!!

 

Possibly PCV? In other cars, I’ve had the PCV diaphragm make a similar noise.

 

I've done the glove test and the glove gets very slightly sucked in, but not aggressively sucked in like I see in videos. Is it possible that the pcv isn't fully done in yet but is on it's way out?

 

Yes, this is quite possible. The diaphragm might simply be stiff or just a little tear. If you have a cheap mechanics stethoscope, you can put it near the PCV and should be able to tell if that’s causing the noise. The type with the cone-shaped end might work best, but I think the rod-type should work also.

 

Thanks a bunch, will try. I made another thread asking about using a Valve Cover Breather on these cars, I hope that can be an alternative to the labor it will cost to replace the PCV system entirely. For reference, I'm asking about this Valve Cover Breather since it has a check ball.