Would you describe the noise as like a cow mooing gently ? if so its the same as ours no big deal other than mooing when you switch of from time to time , you can see they do call them a moo valve on Ebay But as yours is a 97 this may not be the problem . OEM Turbo Solenoid N75 Moo Valve VW T5 Transporter 1.9, 2.0 & 2.5 TDI 1K0906627A 4058633260939 | eBay
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