S60 Owner Going Mad!

[Pointer7]

Good Day All,

Before I tear what's left of my hair out, I would like some suggestions as to what is causing my dull knocking noise at the N/S/R over small ripply bumps. If I go over bumps evenly its silent, if I hit something on just the Nearside it knocks (I did hit it on one side quite hard by accident a few weeks ago and it stopped! but only lasted a week or so)

It's been to two of my local garages which I know very well and trust 100% who can not find a single thing wrong with it underneath, its all very tight and solid so I am now left with checking the interior.

In between these two visits, I have tried everything I can think of. Emptying the boot, taking the floor out, seats down, seats up, the only possibility is now the parcel shelf but that looks a nightmare to remove.

Its a 2014 S60 R Design if that makes any difference!

[Rex65]

You need to get someone to sit in the back whilst you drive around to see if they can locate the noise. Could be the seat base knocking?

[Pointer7]

Someone has sat in the back and said they can hear it near the C pillar....

How would I go about checking the seat base?

[Rex65]

If it's high up in the C pillar it could be a seat belt reel or a harness that has come loose.
Not likely to be seat base if high up especially with someone sitting on it and putting weight on it.

[Pointer7]

hmm I did think the seat base wouldn't knock if someone was sitting on it....

well they said they could hear it behind their left ear but I did check around that area and drove with the belts fastened but no change

[Pointer7]

Having another poke around last night and noticed the headrest was loose in the back.. Wedged it but made no difference.. Checking the seats next

[bomberfr0g]

I had a very annoying knock that took months to resolve, turned out to be the rear top strut mount, worth a check of that.
Mine was a v60 and also had a slightly loose tailgate lock that at low speeds knocked.
I spent several months where nothing could be found using the tried and tested method of fixing annoying sounds = turn up the stereo.

[Pointer7]

The top mount was checked when the car went in a couple of days ok and all was secure... May possibly be the lock on the tailgate but when I pull up on it from the outside when it's shut there is very little play... I could try adjusting the two rubber stoppers I guess

[Hilton]

May be relevant if you have a spare wheel- my XC60 developed a mild thumping in the rear of the car a year ago, which proved to be the wheel not sitting squarely in the well. Ended up fitting a couple of old towels between the well floor and the wheel to close the air gaps before tightening the centre bolt. Knocking disappeared to my great relief - after many hours of searching.

[Pointer7]

Hilton,

I don't have a spare wheel unfortunately but have taken the toolkit out and the floor already but no change.

Interestingly I did adjust the front passenger seat slightly to see if that would help and it was quieter this morning but might just be coincidence..