S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
Vacuum Check Valve HVAC: Testing and Inspection
Vacuum Supply and One-Way Valve, Testing
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Detach hose -B- from two-way valve (N63) and connect vacuum gauge VAG1368 (or equivalent) to hose.
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Start engine and run at idle until the readout has stabilized.
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Switch off engine. Vacuum reading on gauge must not drop by more than 50 mbar within 2 minutes.
NOTES:
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Specification for vacuum when engine running: greater than 250 mbar.
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Removing and installing vacuum reservoir and one-way valve. See: Vacuum Reservoir HVAC/Service and Repair
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Testing -N63-, output Diagnostic Test Mode (DTM). See: Testing and Inspection/Scan Tool Testing and Procedures/Output Diagnostic Test Mode
(DTM) (Function 03)