- Double vacuum unit
- Carburetor engine:
- Diesel engine
- Non-return valve
- Vacuum reservoir
- Vacuum reservoir grommet
- Brown
- T- piece
- Flap box vacuum unit
- Air distributor housing vacuum unit
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‒ Connect vacuum gauge.
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‒ Remove glove box.
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‒ Remove controls trim.
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‒ Start engine, rev up several times until vacuum gauge indicates a vacuum of approx. 0.5 bar (-15 in. Hg).
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‒ Push the air distribution lever (upper lever) and temperature lever (lower lever) to the right as far as they will go (detent position 5).
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‒ Switch off engine (vacuum is stored).
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‒ Wait one minute and check whether the vacuum gauge reading remains unchanged.
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Pay attention to
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Possible fault
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Remedy
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Vacuum gauge indication
drops off, loss of vacuum
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Non-return valve leaking
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Vacuum reservoir grommet leaking
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renew
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Vacuum distributor leaking
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Vacuum reservoir leaking
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one or more vacuum
units operate
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Vacuum distributor defective
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renew
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Having renewed a part, build up vacuum again and repeat test.
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‒ Move the air distribution and temperature levers together, stage by stage from detent position 5 to detent 1. Wait one minute in each detent position. When doing this, the switching positions of the three vacuum units must be watched and compared, as per the adjacent illustrated table, at each appropriate detent position of the air distributor and temperature levers, while paying attention at the same time to the vacuum gauge.
Notes:
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◆ The vacuum gauge needle may only drop back slightly during the time at which the vacuum unit operates.
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◆ If this is not the case, the vacuum unit drawn in solid lines, at that particular detent position, is leaking and must be renewed.
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◆ If only one of the three vacuum units switches according to the table, at a steady vacuum gauge reading, the vacuum distributor is blocked and must be renewed.
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