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Mend Mercedes-Benz W45 Air Locks System

why is my heater working only sometimes?

my heater sometimes works on my 45 then just blows cold. have made sure there are no air locks in system

sue
December 2010
Mercedes-BenzMercedes-Benz W45Vehicles, CarsAir Locks System

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Mercedes W45 Heater Issues - Fixes & Help