380SEC (126.043) V8-3.8L (116.963) (1982)
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With vacuum >0.585 bar, needle of indicator should be at left hand stop, with vacuum approx. 0.4 bar at beginning of red field.
If so, a leak in vacuum system of light range regulation and/or air conditioning system is indicated.
Repair leaks.
If on vehicles with automatic transmission a vacuum control unit on transmission is defective, oil may also be present in indicator and its line.
Clean line and renew indicator.