Vanden Plas L6-4.0L (1990)
Sight Glass: Description and Operation
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A sight glass is located on the output side of the dryer bottle through which the refrigerant flows and is used to indicate the condition of the
refrigerant charge. A clear sight glass normally indicates the system has a correct charge of refrigerant. It may also indicate the system has a
complete lack of refrigerant. This will be accompanied by a lack of any cooling action by the evaporator. Also the system may be overcharged, this
must be verified with test gauge readings.
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Foam or a constant stream of bubbles indicates the system does not contain sufficient refrigerant. Occasional bubbles when the system is first
started is normal.
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Foam or a heavy stream of bubbles indicates the refrigerant is very low. Oil streaks on the sight glass indicate a complete lack of refrigerant. A
cloudy sight glass indicates that the desiccant contained in the receiver/dryer has broken down and is being circulated through the system.
