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1994 GMC Vandura 3500 Question: Over-heating and coolant blow-out through overflow

 

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Visitor, 6.5L V8 Diesel, Valley Stream, NY, July 14, 2010, 16:07

Our van will overheat frequently and VOMIT out anti-freeze through the overflow. Very annoying. I don't think it's the head gasket, as it doesn't do it constantly.... Thermostat? Water pump? Something else?

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