Coolant Pump - Leaks

91porsche03

July 30, 1991


Model Group

944/928 1

Part Identifier Number

1950 9110


Subject:
Diagnosing Coolant Pump Leaks


ATTENTION: Service Manager/Service Technician

Models Affected: 944/928, all liquid cooled vehicles

Concern: Unnecessary replacement of coolant pumps.





General Information: Parts testing revealed no defects on a high number of coolant pumps replaced for leaks. Sweat at sealing areas, usually white grey or green grey depending on coolant color, does not justify the replacement of the coolant pump. A small amount of coolant loss from the breather hole of the coolant pump especially during approximately the first 1000 miles of operation is normal. The coolant pump only needs replacement if there is a noticeable leak, like coolant on the garage floor or if the coolant level drops below the minimum mark with a cold engine because of coolant pump leaks.