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% Cooling
AMM
% 3. Operation
% When the engine is cold, the thermostat valve closes the main circulation. The coolant pump moves % the coolant through the engine. The coolant becomes warm. The coolant flows out of the thermostat % valve through the bypass circulation pipes directly to the inlet of the coolant pump.
% As the engine becomes hot, the temperature of the coolant increases. The thermostat valve senses % the increased temperature and starts to open. Some coolant goes through the bypass circulation % directly to the coolant pump inlet. Some coolant goes through the main circulation through the coolant % radiator. Air flowing through the coolant radiator cools the liquid coolant. The cool liquid returns to the % inlet of the coolant pump and mixes with the hot coolant from the bypass circulation.
% The thermostat valve adjusts the flow of coolant through the main and bypass circulations to give the % correct temperature. It starts opening at 84 °C (183 °F) and opens fully at 94 °C (201 °F), allowing the % coolant to flow through the coolant radiator.
% The connection for the cabin heat system supplies coolant at the outlet temperature from the engine % at all times.
Page 4 Doc # 6.02.01 09 Jan 2003 Rev. 4
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DA 40 Series
%
Cooling
AMM
% Trouble-Shooting % 1. General
% This table tells you how to trouble-shoot the liquid cooling system. If you find the trouble in column 1, % do the repair in column 3.
% This trouble-shooting table gives only troubles to the airplane parts of the cooling system.
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Trouble Possible Cause Repair
Engine over-heats (CT caution light illuminates). Flat-belt worn or broken. Coolant level low. Coolant leak. Air in cooling system. Radiator screen blocked by foreign objects. Radiator screen damaged by foreign objects. Thermostat valve does not work properly. Defective coolant pump. Defective cylinder head gasket. Refer to the engine manufacturer. Fill the cooling system. Refer to Section 12-10. Look for leaks at all system joints. Repair or replace defective components. Bleed the cooling system. Remove foreign objects and clean radiator screen. Replace radiator. Refer to the engine manufacturer. Refer to the engine manufacturer. Refer to the engine manufacturer.
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