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.