Insane clunk in front - Boxster S 2002

[Orjanus]

Can someone help me we a fresh view - I have an annoying clunk somewhere in the front of my Boxster and I need a fresh start.

It has been at two Porsche specialists, I have changed the drop links, the steering rods and the main tie rods, to no avail at all. I have also stripped most of the front, bent & knocked on most things, still no clue.

Symptom: a distinct clunk that you hear when driving slow. The smallest bump in the road makes it happen (my best description of the character of the sound: imagine you had not tightened the center bolt on the spare wheel so that it could "wiggle" back and forth a little, that kind of clunk/noise. And yes, I have of course tried taking out the spare and the jack etc.)

A clue: it has something with heat to do. If I start the car when it is 20 C/68 F outside, I need to drive for quite a while before the clunking starts. But if it has been parked in the sun when we have 28 C/82 F, it starts almost immediately, after just a short ride.

I know this sounds weird, because I have spent two seasons trying to find & eliminate this b****y noise, it is driving me insane(r).

Grateful for any fresh takes and/or own experiences. And btw, the car is in good shape and works flawlessly, apart from this.

Orjan-in-Stockholm