17 00 009 Checking cooling system for leaks (W11)

Special tools required:

WARNING: Risk of burning and scalding!
Only perform this work after engine has cooled down.

Checking pressure drop in cooling system:

Remove cap from expansion tank.

Connect special tool 17 0 051 to expansion tank. Connect special tool 17 0 002.

Fig 1: Connecting Special Tool To Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

Pressurize cooling system to 1.5 bar and wait approx. 2 minutes.

Cooling system is tight if pressure drop does not exceed 0.1 bar.

Checking pressure relief valve in cap:

Remove rubber seal from special tool 17 0 002.

Connect special tools 17 0 052, 17 0 008 and 17 0 002 to cap.

Fig 2: Connecting Special Tools To Pressurize Cap

Courtesy of BMW OF NORTH AMERICA, INC.

Pressurize cap.

Opening gauge pressure must be 0.89 - 1.20 bar.