When there is a lot of direct sunlight into the E46 car.
When you first drive it - there is a kind of crack noise from
somewhere in the back - not exactly a rattle as it can "crack" even
when the car is stationary.
When you turn the AC on - and the inside cools down it seems to go.
And in non-hot weather - there is no problem at all.
Has anybody else experienced this or am I going mad?