Garage 808
New member
If you have a 320D E90 and there's an annoying noise from the engine and the air hose keeps coming loose, it may be because that hose has shrunk.
It's common that the hose ("rubber boot") shrinks from the turbo's heat, after the engine's been washed. The original part has been superseded with a hose made of different materials, intended to NOT shrink. Here's a comparative photo of old and new, as well as the agents' part number.
It's common that the hose ("rubber boot") shrinks from the turbo's heat, after the engine's been washed. The original part has been superseded with a hose made of different materials, intended to NOT shrink. Here's a comparative photo of old and new, as well as the agents' part number.