The red coolant warning light may be on. The customer may complain that there is coolant loss. There is evidence of dried coolant from two leakage holes on the drive of the coolant pump. The coolant pump is sealed with a slip ring seal to the input shaft. To prevent the seal from drying out, a minor coolant leak is necessary to keep the seal lubricated.
Excess coolant from the minor leak is discharged through two leakage holes on the coolant pump. This minor leak is normal operation of the coolant pump, and it is not responsible for coolant loss. This discharged coolant may dry and encrust the coolant pump.
