17 00 039 Venting and filling cooling system with vacuum filling unit: Requirements

• Cooling system expansion tank must be empty.
• There must be sufficiently premixed coolant in the filling unit container, 1-2 liters more than the vehicle filling capacity.

  Use only recommended coolant. See COOLING SYSTEM - OPERATING FLUIDS .

  Observe mixture ratio. See COOLING SYSTEM - OPERATING FLUIDS .

  • Observe capacities.
• Position the filling unit container at the same height as the coolant expansion tank.
• Compressed-air connection with 6 bar pressure present.
• Set vehicle heater to maximum temperature.

Select adapter (Y) according to table and connect to coolant expansion tank.

Connect filler unit to adapter connection (X).

Fig 1: Identifying Adapter And Adapter Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Shut-off valves (A) and (B) of the filling unit (1) must be closed.

X) Expansion tank connection

Fig 2: Identifying Filling Unit Shut-Off Valves

Courtesy of BMW OF NORTH AMERICA, INC.

Connect venturi nozzle (1) to filling unit (2).

X) Expansion tank connection

Fig 3: Connecting Venturi Nozzle To Filling Unit

Courtesy of BMW OF NORTH AMERICA, INC.

Connect compressed air (1).

X) Expansion tank connection

Fig 4: Connecting Compressed Air Line

Courtesy of BMW OF NORTH AMERICA, INC.

Open shut-off valve (B).

The venturi nozzle produces a flow noise.

Fig 5: Opening Shut-Off Valve

Courtesy of BMW OF NORTH AMERICA, INC.

Then open shut-off valve (A) until the filling hose (1) is free of bubbles.

Close shut-off valve (A) again. The filling hose (1) is vented in this way.

Fig 6: Opening/Closing Of Shut-Off Valve

Courtesy of BMW OF NORTH AMERICA, INC.

Shut-off valve (B) remains open. Generate vacuum in coolant system for approx. 2 minutes. The final vacuum is reached at a vacuum of -0.7 to -0.95 bar. Green scale on the vacuum meter.

Then close shut-off valve (B) again.

Fig 7: Checking Shut-Off Valve Opening Time

Courtesy of BMW OF NORTH AMERICA, INC.

Both shut-off valves (A) and (B) must be closed. Then seal Venturi nozzle (1).

Fig 8: Seal Venturi Nozzle

Courtesy of BMW OF NORTH AMERICA, INC.

The cooling system must hold the vacuum for 30 seconds. If the needle in the vacuum meter falls, this indicates a leak in the cooling system.

If the vacuum remains constant, proceed with filling.

In event of leaks, check cooling system for leaks.

Fig 9: Identifying Vacuum Meters

Courtesy of BMW OF NORTH AMERICA, INC.

Shut-off valve (B) remains closed during the filling process.

To fill the cooling system, open shut-off valve (A) to filling unit container.

Fig 10: Opening Shut-Off Valve To Filling Unit Container

Courtesy of BMW OF NORTH AMERICA, INC.

Coolant is now added.

The filling process is finished when the needle in the vacuum meter is at 0 bar or no longer falls.

If necessary, reduce remaining vacuum. Open shut-off valve (B) to do so.

Fig 11: Filling Coolant

Courtesy of BMW OF NORTH AMERICA, INC.

Remove filling unit with adapter from expansion tank.

Adjust coolant level to max.

Close coolant expansion tank.

Fig 12: Adjusting Coolant Level To Max

Courtesy of BMW OF NORTH AMERICA, INC.

Check function of cooling system.

Check cooling system for leaks.