Refrigerant Level Check

A sight glass is incorporated in the receiver-to-evaporator hose at the receiver end. The sight glass provides a visual check of the system refrigerant level. A continuous stream of bubbles will appear in the sight glass of a system which is not properly charged. Properly charged and completely discharged systems will appear similar through the sight glass because the lack of bubbles. To distinguish between the two situations, cycle the magnetic clutch off and on with the engine running at 1500 RPM. During the time the clutch is off, bubbles will appear in the sight glass if refrigerant is in the system and disappear when the clutch is on. If no bubbles appear when cycling the magnetic clutch, there is no refrigerant in the system.

If the system is discharged, it will be necessary to leak test, repair as necessary, evacuate and recharge the system.