Volvo Penta only uses liquid-cooled engines. The cooling system comprises a cooling water system and a cooling air system. The objective of the system is to lead heat from the engine to the surrounding atmosphere. Around 40 % of fuel energy is used to perform mechanical work, while the rest is lost as heat to the coolant and through the exhaust.
The fan plot only applies to a given air temperature, normally 20 °C (68 °F), which gives an air density of 1.2 kg/m3 (0.075 lb/ft.3). If the plot is not drawn for 20 °C the actual temperature and density must be specified. The pressure from the fan plot must be recalculated for other temperatures. If the fan graph applies to an air density of ρ0 and the actual air density is ρ1, the pressure ρ0 from the graph is recalculated as follows:
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.
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).
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