Radiator shutter DDE 5.0

The radiator shutter seals off the engine compartment from the outside and directs the cooling air under the engine.

Components

• Radiator shutter
  
• Vacuum unit with actuating rod
  
• Pressure converter
  

Function

The pressure converter connects the vacuum unit with the vacuum supply by means of hoses. When activated by the DDE control unit, the pressure converter switches vacuum through to the vacuum unit and the radiator shutter closes (= standard setting).

The radiator shutter is opened at:

• Coolant temperature > 111°C or
  
• Fan speed > 3000 rpm
  

Troubleshooting

If a fault is detected in the control of the pressure converter, the following ”Radiator shutter” faults may be detected:

• 41C0, Activation short circuit to B+
  
• 41C1, Activation short circuit to B-
  
• 41C2 Activation circuit break
  
• 41C3, Excess temperature output stage
  

If a fault occurs, the radiator shutter opens (unless there is also a mechanical fault and the radiator shutter is sticking).

The radiator shutter is also opened if a fault on the coolant temperature sensor or the electric fan is detected.