17 00 010 Checking for leaks between cooling system and combustion chamber
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 BMW 540i, 2002 BMW 540i, 2001 BMW 540i, 2000 BMW 540i, and 1999 BMW 540i. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Danger of scalding!
Only perform this work after engine has cooled down.
Only perform this work after engine has cooled down.
CAUTION:
When engine is running with cooling system depressurized, this can create steam bubbles.
These cause the engine to overheat.
Observe coolant temperature.
These cause the engine to overheat.
Observe coolant temperature.
Check for leaks in cylinder head with CO leak tester following manufacturer's instructions for use.
In the event of a leak, the color of the test liquid turns yellow by the carbon dioxide (combustion gas) entering the cooling system.