Vacuum system, servicing Page 1 of 4
87-185
Vacuum system, servicing
Fresh/recirculating air flap vacuum unit,
testing
- Detach hose -C- from two-way valve and connect vacuum pump US
8026, VAG1390 (or equivalent) to hose.
- Produce a vacuum (fresh/recirculating air flap moves against stop in
recirculating air mode position and remains in this position).
Note:
Removing and installing vacuum unit page 87-186 .
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Vacuum system, servicing Page 2 of 4
87-186
Fresh/recirculating air flap vacuum unit,
removing and installing
- Remove heater/air conditioner assembly
complete with instrument panel page 87-159 .
- Remove screw A.
- Detach vacuum unit.
Setting X = 50 mm (1-31/32 in)
- Install in reverse order of removal.
Notes:
Do not disassemble air conditioner.
When installing, check for free operation.
Test vacuum system page 87-187 .
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Vacuum system, servicing Page 3 of 4
87-187
Vacuum supply and one-way valve,
testing
- Detach hose -B- from two-way valve (N63) and connect vacuum gauge
VAG1368 (or equivalent) to hose.
- Start engine and run at idle until the readout has stabilized.
- Switch off engine. Vacuum reading on gauge must not drop by more
than 50 mbar within 2 minutes.
Notes:
Specification for vacuum when engine running: greater than 250 mbar.
Removing and installing vacuum reservoir and one-way valve page
87-188
Testing -N63-, output Diagnostic Test Mode (DTM) page 01-42 .
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Vacuum system, servicing Page 4 of 4
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Vacuum reservoir with one-way valve,
removing and installing
- Remove heater/air conditioner assembly
complete with instrument panel page 87-159 .
- Remove screws -A-.
- Install in reverse order of removal.
Note:
Testing vacuum system page 87-187 .
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