Antifreeze and Engine Coolant
VW Passat

What is wrong if 2000 Passat V6 emits a chemical burning smell under the hood Coolant starts boiling in the reserve tank Engine temperature Rad cap Coolant level and coolant reserve cap all okay?



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Have you had all your belts checked? A belt under undue friction or that is melting would cause a horrid burning odor, sort of like a bad belt on a vac cleaner.

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Are you sure it's boiling? There is an electric pump that keeps it moving when you shut off the car. Many people perceive this as boiling.

That chemical smell is probably because the seals under your cam chain tensioners have shrunk and are letting crankcase fumes out.