S 600 Sedan (140.057) V12-6.0L (120.982) (1996)
CHECKING VALVE BLOCK (Y11):
1. Ignition switched off.
2. Connect grey-green vacuum line to tester.
3. Evacuate with tester and read off pressure gauge. If a pressure increase occurs on the pressure gauge, renew valve block (Y11) or grey-green
vacuum line.
NOTE: If no fault was found on the above test, the vacuum elements of the automatic climate control (KLA) are to be checked.