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Low coolant and brown scum , causes?
Hi, my son has a 2010 tdi manual Tiguan , and had the cooling warning light come on yesterday, upon looking it was below min in the reservoir. But there was also a lot of brown scum in the reservoir. He put some water in which enabled him to drive home from work , but is obviously worried about what caused the loss and what is causing the brown scum? The car was only serviced 2 or 3 months ago and had the timing belt and water pump replaced , could any of that be involved? He rang a mate who is a mechanic who said it might be the ERG valve , or head gasket ?
Any suggestions please ?
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