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% A temperature sensor at the rear of the thermostat valve connects to the engine control system. The % top engine indicator shows the coolant temperature (COOLING TEMPERATURE).
% The cooling system has 2 circuits. There is a main circuit and a bypass circuit.
% For the main circuit, large diameter hoses and pipes connect the thermostat valve to the inlet of a % coolant radiator. The coolant radiator is located above and to the rear of the engine at the left. Large % hoses and pipes connect the outlet from the coolant radiator to an inlet on the engine crankcase at % the rear, left. This is the inlet to the engine coolant pump.
% For the bypass circuit, large diameter hoses and pipes connect the bypass outlet from the thermostat % valve to the inlet for the coolant pump.
% An coolant tank is located inboard and slightly above the coolant radiator. This is the highest point in % the system. A small diameter hose connects the highest point in the coolant radiator to the top of the % coolant tank. Another small diameter hose serves as overflow line to the exterior of the airplane.
% A small diameter hose connects the bottom of the coolant tank to the inlet to the coolant pump. This % hose has an orifice.
% A coolant level sensor is installed in the coolant tank. It operates the WATER LEVEL caution light in % the Auxiliary Engine Display (AED).
% Pipes and hoses connect the thermostat valve to the inlet of the cabin heat heat-exchanger. The % return flow from the heat-exchanger connects to a tapping on the bypass circuit pipes adjacent to the % thermostat valve.
% Both cabin-heat pipes have bleed points at the highest points of the cabin heat circuit.
Doc # 6.02.01 Page 3
Rev. 4 09 Jan 2003

75-01-00
% 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
75-01-00
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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