2004 V70 Whining Noise from Engine (with video)

plafratt · Post by **plafratt** » 28 Jun 2015, 19:21

Today, after turning off my car, I noticed a whining noise coming out of my engine. It decreased in pitch and volume over about 30 seconds after turning the car off.

I turned the car back on, and noticed that the noise did the opposite when the car is turned on: it increases in pitch and volume for several seconds and then stabilizes to a particular pitch and volume as the car idles.

I recorded a video so that you can hear the noise, in case that might help: link. The noise starts to become noticeable about 10 seconds into the video.

Does anyone know if it is safe to drive like this? Any help is appreciated.

Thanks,
Patrick

P.S. Sorry, I just noticed that I posted this in the wrong forum, but I don't see a way to move it or delete it. If anyone knows how to help with this, I am open to suggestions. Thanks.

Post by **xHeart** » 29 Jun 2015, 09:25

I will raise the front of the car on jack-stands, remove the front wheels, and bring engine to operating temperature.

And then listen for the noise from the passenger side wheel well.
Not saying, it sounds like water-pump bearing.

It needs to be isolated carefully, there are too many possibilities at this point.
How many miles on it? History of schedule service?

plafratt · Post by **plafratt** » 29 Jun 2015, 09:33

175,000 miles. I have kept up oil changes and check fluids. Is there a particular service about which you are curious?

Thanks for the response.

plafratt · Post by **plafratt** » 29 Jun 2015, 09:40

Another thing worth mentioning is that the sound was gone this morning. Yesterday was a very hot day, and I had been driving on the interstate for an hour with the AC running before turning off the car, at which point I noticed the problem. The sound persisted throughout the evening yesterday, but the sound was gone this morning.

Post by **xHeart** » 29 Jun 2015, 09:44

It will need additional care with those many miles.

How smooth is auxiliary belt when running? Was it ever changed?
Was timing belt on schedule, what parts replaced?

plafratt · Post by **plafratt** » 30 Jun 2015, 08:59

I haven't noticed any roughness when driving. Are there particular symptoms I should look out for with respect to the auxiliary belt? I have never had the auxiliary belt replaced. I bought the car with 100k miles, so a previous owner might have had it replaced.

I did have the timing belt replaced a little while ago. It was maybe at about 150k. The only other part I can remember replacing is an ignition coil.

Thanks.

Post by **xHeart** » 02 Jul 2015, 11:17

plafratt wrote:I haven't noticed any roughness when driving. Are there particular symptoms I should look out for with respect to the auxiliary belt? I have never had the auxiliary belt replaced. I bought the car with 100k miles, so a previous owner might have had it replaced.

I did have the timing belt replaced a little while ago. It was maybe at about 150k. The only other part I can remember replacing is an ignition coil.

Thanks.

Well, there are several items with just too many miles.
The auxiliary belt has to come off to check for cracks. I would also take off the tensioner and check for play. Don't wait for it to fail. These two can be replaced relatively easily for fewer $$.

It will have an stabilizing effect on alternator, PS pump, oil pump, A/C compressor, and could improve battery charging too.

I would forget about previous owner's services and maintenance. Start Fresh!

Post by **JBC2565** » 02 Jul 2015, 12:50

Is this a turbo car?
Have you checked the PCV?
Video below.

Post by **precopster** » 02 Jul 2015, 15:51

There is an intercooler pipe leading to the turbo over the top of the engine so of course it's a turbocharged car.

If noise stays on use a long screwdriver and touch the engine at various places while holding the handle to your ear. This is a mechanic's rudimentary stethoscope.

Remove serpentine belt while engine is operating with the noise (of course switch off engine first) and see if noise goes away. Turn the accessory idler by hand while it's off to check for coarseness and also turn power steering pump and alternator by hand to check for play or coarseness.

Replace serpentine belt !! Too many miles on it. The grooves on that belt can be so worn that it causes a mild slipping and noise.

Do you always have headlights on during the day? This will wear an alternator out in no time.

plafratt · Post by **plafratt** » 08 Jul 2015, 17:10

Thanks for all the responses. I will look into the serpentine belt, tensioner, auxiliary belt, and PCV.

JBC2562: precopster is correct, it is a turbo.

precopster: The headlights run during the day automatically. My manual on page 34 says:

"Models with daytime running lights: Low beam headlights will automatically come on if the ignition key is in position II. Front and rear parking lights and license plate lights will also be on.

Volvo recommends the use of daytime running lights. If, however, you would prefer to have these lights turned off (USA only), please consult your Volvo retailer."

Thanks again.