T5 2.5 diesel Engine Noise - Strange 'Whistle'? | VW T4 Forum - VW T5 Forum
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T5 2.5 diesel Engine Noise - Strange 'Whistle'? | VW T4 Forum - VW T5 Forum
I have exactly same issue. It’s started about 7000 Km ago, since that I replaced one hose, inter cooler, reseald inlet manifold, but it’s still there.
Please, let me know if u found it.