my 99 audi a4 s4 quattro 2.7 biturbo recently started making a weird squidgy whining noise on cold startups. The sound goes away after 5/10min start driving.
the car drive normal with out any problems.
and just do the noise in the first start up ???

I think that the noise come from the passenger side just below the dump valves (around that area) but have no clue what could be causing it, or whether I should be worried.

any ideas ???