S 500 Coupe (140.070) V8-5.0L (119.970) (1995)
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.