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Message: <blockquote data-quote="jarance" data-source="post: 229895" data-attributes="member: 21">Rust should not be a problem for our cooling system. The cooling system of an UDM consist of the following:-1. Radiator (Copper or Aluminium)2. Rubber Hose (Rubber)3. Water Pump (Aluminium or plastic)4. Thermostat (Aluminium)5. Engine block (Aluminium)6. External Fan.Rust is usually formed when there is ferrous material (iron) in the water medium. Our "tap" water contained many added material. Look at how often you have to clear the filter near the "tap meter" at your home and you will know what I mean. :wink: We term this type of water as "hard" water. If you boil water in a kettle, you will find a thin layer of scaling on the inner surface of the kettle over time. The scaling will prevent or retard the heat transfer. Similarly, in our UDM, the process is reverse of boiling water process. Heat is generated from the combustion engine. Water is pass thru the engine block via water jacket in the engine block. Water circulation is assist by water pump. When water temperature reached a certain set point, the thermostat will open and divert/pass the water to the radiator. Radiator heat up and another temperature switch will switch on the electric fan. (If the car use fan cluth, then cooling fan will spin faster!!!).  Meanwhile, the water's impurity will start to scale the inner wall of the cooling system. This will make the engine to run at higher temperature as the heat cannot transfer effectively from the radiator.</blockquote>

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