I noticed that there's weird sound under the hood.
It seems to come form the area that is encircled with red line.

What could be the cause of this?

Car is Volvo XC90 2007 136 kw diesel.

I'm planning to replace Volvo XC90 (2007) rear blown Dynaudio speakers with aftermarket ones. The issue I've come across is the speaker connector. Volvo speaker wire have this kind of connector https://www.upload.ee/thumb/13233597/IMG_20200308_162841.jpg But aftermarket speakers have different conne...

Some bulbs of central console buttons backlight are dead so I would like to replace them.
From internet search I've found controversial info about bulbs.

Can anyone confirm what are the correct bulb types for button background light?

It's solved! When window lift switch lock is active (like I had) then window switch backlight is not on. Quite clever design!

I noticed my XC90 (2007) rear door window switch backlight does not work on both rear doors.

But then I started to think that are they even backlit...
Can any other XC90 owner confirm if rear door windows switches are with backlight or not?

There's a condensation in left taillight.

I took taillight apart and dried it but after rainy day condensation reocurred.

How to solve this problem?

I tried but failed to find information online which Volvo S80 models have PowerShift and which have Geartronic gearbox.
I'm specifically interested in S80 2013 D5 AWD 2.4 158 kW gearbox type.
Does anybody have more information about this?

How smooth should Volvo S80 2005 5-speed automatic gearbox ideally be?
Form time to time I feel gear changes, especially from second to third. It's definately not rough but you feel the gear has changed.

Is this kind of behaviour normal or is it a sing of upcoming gearbox problems?