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Home >> BMW >> 2009 >> X5 35d >> Repair and Diagnosis >> External Pages >> Different car >> Section 630 (Cooling System - Repair (M54)) >> Coolant, Checking Cooling System >> 17 00 039 Venting cooling system and checking for leaks (M54) >> Adding Coolant:

Adding Coolant:

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To ensure the cooling system is properly vented, it is absolutely essential to follow the steps below:

  1. Open cap (1) on coolant expansion tank.
    2. Fig 1: Opening Cap On Coolant Expansion Tank
    G03310741Courtesy of BMW OF NORTH AMERICA, INC.
  2. Open vent screw (2).
  3. Switch on ignition.
  4. Set heater control to maximum temperature.
  5. Set fan to lower speed (so that heater valves open).
  6. Fill with coolant slowly.
  7. Close vent screw (2) when bubble-free coolant emerges.
  8. Pour coolant into coolant expansion tank up to max. cold fill level. Marking (2) is then on a level with upper edge of coolant expansion tank.
    9. Fig 2: Identifying Mark On Coolant Tank
    G03310742Courtesy of BMW OF NORTH AMERICA, INC.
  9. Close coolant expansion tank
  10. Allow engine to warm up until thermostat opens
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