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Home >> BMW >> 2016 >> Z4 sDrive35is >> Repair and Diagnosis >> External Pages >> Different car >> Section 751 (Cooling System - Repair) >> Coolant, Checking Cooling System >> 17..... Venting cooling system for charge air cooler (N74) >> Venting cooling system

Venting cooling system

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NOTE: Do not leave the coolant expansion tank sealing cap open during the bleeding procedure.

Switch on the low-beam headlights to perform the bleeding procedure. If the low-beam headlights are not switched on, the ignition (Terminal 15) will switch off automatically after a certain period of time and interrupt the bleeding procedure.

  1. Top coolant up to the upper edge of the expansion tank. Coolant level may not drop further! No drop in coolant for approx. 1 minute.
  2. Connect battery charger.
  3. Switch on ignition and low-beam headlight.
  4. Set heating to maximum temperature. Press Automatic button. Then set the blower to the lowest speed.
  5. Press accelerator pedal for 15 seconds to floor. Engine  must not  be started.
  6. The bleeding procedure is started when the accelerator pedal is pressed and takes approx. 5 minutes.
  7. Refill expansion tank up to top edge immediately after drawing off until empty.
  8. Adjust expansion tank to maximum level at end of bleeding procedure.
  9. Check cooling system for leaks.
  10. Close expansion tank.
  11. If the bleeding procedure has to be carried out again, allow DME to drop completely (ignition key removed for approx. 3 minutes), then repeat from Item  5.