17 00 009 Checking For Coolant Leaks (N62)

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

17 0 002
17 0 005
17 0 007
17 0 008

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 tool 17 0 002/ 17 0 005 .

Build up gauge pressure of 1.5 bar, wait approx. 2 minutes.

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

Fig 1: Identifying Special Tools (17 0 002) And (17 0 005)

Courtesy of BMW OF NORTH AMERICA, INC.

Checking function of cap:

Detach rubber (1) from special tool 17 0 002 .

Fit special tool 17 0 007/ 17 0 008 .

Fig 2: Identifying Rubber, Special Tools (17 0 007) And (17 0 008)

Courtesy of BMW OF NORTH AMERICA, INC.

Screw cap (1) onto special tool 17 0 007.

Pressure relief valve must open between 1.65 and 2.2 bar.

Build up pressure with special tool 17 0 002 and watch pressure gauge to ascertain when opening pressure is reached. 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 3: Identifying Screw Cap And Special Tools (17 0 007)

Courtesy of BMW OF NORTH AMERICA, INC.