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More info would help here, what year passat? What engine? Generally I recommend that flushing the cooling system with OHC belt replacement. If the water pump is driven by the toothed cam belt replace the unit while you're there. This will necessitate coolant replacement. Suggest that replacement of the thermostat be also done at this time.

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Q: When replacing the timing belt on a VW Passat - does the coolant need to be replaced and the radiator hoses disconneted?
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