Porsche Water Pump Misdiagnosis

This bulletin applies to Porsche Cayenne, Cayenne Turbo, Boxster and Panamera vehicles with regard to unnecessary water pump replacement. 

Test results for coolant pumps returned to Porsche under warranty with the damage category “Leaking” were indeed found to have traces of coolant residue, but a function test has shown that almost all of the coolant pumps that were diagnosed as leaking were actually fully functional and were not leaking. 

Slight traces of coolant residue on the pump housing is not an indication of pump leakage and may not be a reason for pump replacement. If there are slight traces of coolant residue on the pump housing and the traces are dry and there are no apparent drops forming, there are no technical grounds for pump replacement.  

If coolant residue is wet and drops of coolant have formed, the pump must be replaced.



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Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

About the Author

Mike Mavrigian | Editor

Mike received a BA degree from Youngstown State University in English Literature with a minor in Journalism in 1975.