500SEL (126.037) V8-5.0L (117.963) (1984)
5. Connect tester to connection A of switchover valve and evacuate.
The permissible values of vacuum must be maintained. If tester shows a pressure increase, the switchover valve is defective.
6. Test electric function of valve, apply external voltage for this purpose. The valve will then open. Readout on tester returns to zero.
7. Connect tester to connection B. Close connection A with blind plug, apply voltage and evacuate.
Permissible values of vacuum should remain.
8. Remove voltage on switchover valve. Readout on tester should return to zero.
9. Reconnect vacuum lines according to function diagram.
10. Plug-on electric couplings (2-point) 1 to 6.
11. For installation of righthand lateral lining and covering proceed vice versa.