17 00 009 Checking For Coolant Leaks (N73)

WARNING: This page is about a different car, the 2008 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

17 0 101
17 0 102
17 0 105
17 0 106

WARNING:

Danger of scalding!

Only perform this work after engine has cooled down.

Checking for leaks in cooling circuit:

Open cap on coolant expansion tank.

Fit special tools 17 0 105 /17 0 101 .

Build up gauge pressure of 2 bar, wait approx. 2 minutes.

Cooling system is leak-free if pressure drop is max. 0.1 bar.

Fig 1: Identifying Special Tool (17 0 105) & (17 0 101)

Courtesy of BMW OF NORTH AMERICA, INC.

Checking function of cap:

Fit special tools 17 0 101 /17 0 102 /17 0 106 .

Screw sealing cap onto special tool.

NOTE: Pressure relief valve must open between 1.75 and 2.2 bar.

Build up pressure with special tool 17 0 101 and observe pressure gauge to ascertain when opening pressure is achieved. Note down measured opening pressure.

After a waiting period of approx. 30 seconds, the pressure must no longer drop by more than 0.4 bar below the measured opening pressure.

Fig 2: Identifying Special Tool (17 0 105) & (17 0 102)

Courtesy of BMW OF NORTH AMERICA, INC.

Remove special tools.

Check liquid level in cooling system; if necessary: replenish.