Pump suction capacity depends on coolant pressure and temperature. An increase in coolant temperature reduces suction capacity. In order to avoid cavitation there must be a static pressure on the suction side of the pump. To achieve this there must be a hose from the expansion tank to the suction side of the pump.
The function of the cooling water system is to transport heat energy away from the engine and accessory components to the radiator. The cooling water system consists of the coolant and the following components:
If an air conditioning condenser is used it is normally located in front of the radiator on a sucking fan system. The condenser causes a cooling air pressure drop and temperature rise. A condenser in operation may raise the temperature by 3-5 °C (37.4–41 °F).
Make it a habit to give the engine and engine compartment a visual inspection before starting the engine and after operation once the engine has stopped. This will help you to discover quickly if anything abnormal has happened, or is about to happen.
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