Drivability complaints caused by cooling system

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Drivability complaints caused by malfunction within the cooling system

  • Lack of power when the engine is under load or when accelerating up a hill.
  • Transmission up shifts cease under heavy acceleration.
  • Noticeable hesitation when accelerating at cruising speeds.


When there is a failure of a cooling system component, the “power reduction mode” strategy is implemented.

The Power Reduction Mode was introduced with the E65, excluding the N73 engine. This program is designed to offer protection to the engine in an overheating situation.


  • Coolant Temperature above 117 C : The engine enters the power reduction mode, no check control messages or fault indicators displayed indicating that the engine is in the power reduction mode. A particular fault for an individual cooling system component may be stored in the DME control unit.


  • Coolant Temperature above 120 C : The power reduction mode is now active. A yellow check control message is displayed, Drive Moderately – Engine Hot. Faults for individual cooling system components may be stored in the DME control unit.


  • Coolant Temperature above 125 C : The power reduction mode is active. A red check control message is now displayed, stating Stop Vehicle – Engine Overheated. Faults are stored in the DME for individual components of the cooling system.
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