Vacuum Distribution & Switchover Valve Block
WARNING: This page is about a different car, the 1999 Mercedes-Benz SL500 and 1998 Mercedes-Benz SL500. However, it is still accessible from the selected car via links, so may be relevant.
- Remove vacuum distributor block. See SWITCHOVER VALVE BLOCK under REMOVAL & INSTALLATION. Apply 8.9" Hg of vacuum to port "P" on distributor block. Distributor block should not leak more than .9" Hg in one minute. If system operates as specified, go to next step. If system does not operate as specified, check and repair vacuum distributor block, vacuum reservoir and vacuum lines.
- Apply 8.9" Hg of vacuum to port "1" on distributor block. Distributor block should not leak more than .9" Hg in one minute. If system operates as specified, go to next step. If system does not operate as specified, check and repair vacuum distributor block, vacuum reservoir and vacuum lines.
- Apply 8.9" Hg of vacuum to port "4" on distributor block. Distributor block should not leak more than .9" Hg in one minute. If system operates as specified, go to next step. If system does not operate as specified, check and repair vacuum distributor block, vacuum reservoir and vacuum lines.
- Disconnect vacuum reservoir vacuum line. Apply 8.9" Hg of vacuum to vacuum reservoir port. Vacuum reservoir should not leak more than .9" Hg in one minute. If system operates as specified, go to next step. If system does not operate as specified, check and repair vacuum reservoir and vacuum lines.
- Disconnect switchover valve block Green vacuum line. Apply 8.9" Hg of vacuum to switchover valve block port. Switchover valve block should not leak more than .9" Hg in one minute. If system operates as specified, system is operating normally at this time. If system does not operate as specified, check and repair switchover valve block and vacuum lines.