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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 00 039 Venting cooling system and checking for watertightness (N74) >> Venting cooling system

Venting cooling system

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Bleeding procedure for vehicles up to 03/2010 (heating pump in heater feed hose)  .

  1. Add coolant up to top edge of the coolant filler neck. Coolant level must not drop any further (no drop in coolant for approx. 1 minute).
  2. Connect the battery charger and switch on the ignition.
  3. Driving experience switch must not be set to ECO PRO!
  4. Set heater to maximum temperature. Press Automatic button (if present) and turn blower down to lowest stage (for a minimum period of 5 minutes).
  5. Check coolant level and add coolant if necessary.
  6. After switching off the heating pump, set the heating to min. temperature and switch off the blower.
  7. Check cooling system for tightness.
  8. Close off the coolant filler neck.
  9. Switch on air conditioning.
  10. Start engine and run at increased idle for approximately 1 minute.
  11. Then press on the accelerator three times for 5 seconds each to approximately 4000 RPM. Then let the vehicle idle for about 5 minutes.
  12. Warm up engine and activate map thermostat via diagnosis system.
  13. When the engine has cooled off, check the coolant level and adjust it to approx. 110 mm to 160 mm below the upper edge of the coolant filler neck (described further below in these instructions).

Bleeding procedure for vehicles from 03/2010 (heating pump in heater return hose)  .

  1. Add coolant up to top edge of the coolant filler neck. Coolant level must not drop any further (no drop in coolant for approx. 1 minute).
  2. Connect the battery charger and switch on the ignition.
  3. Driving experience switch must not be set to ECO PRO!
  4. Check coolant level and add coolant if necessary.
  5. Check cooling system for tightness.
  6. Close off the coolant filler neck.
  7. Set heater to maximum temperature. Press Automatic button (if present) and turn blower down to lowest stage (for a minimum period of 5 minutes).
  8. Start engine and run at increased idle for approximately 1 minute.
  9. Meanwhile, press on the accelerator three times for 5 seconds each to approximately 4000 RPM. Then let the vehicle idle for about 5 minutes.
  10. Warm up engine and activate map thermostat via diagnosis system.
  11. When the engine has cooled off, check the coolant level and adjust it to approx. 110 mm to 160 mm below the upper edge of the coolant filler neck (described further below in these instructions).

When the engine has cooled off, check the coolant level and adjust it to approx. 110 mm to 160 mm below the upper edge of the coolant filler neck (described further below in these instructions). Use a tape measure where appropriate.

Fig 1: Identifying Coolant Level Adjustment Length
G08504260Courtesy of BMW OF NORTH AMERICA, INC.

Close coolant expansion tank.

Installation note: 

Close the sealing cap (1) until the arrows line up.

Fig 2: Identifying Sealing Cap
G08504261Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

CHECK  cooling system for leaks.

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