This is an auxiliary water pump designed as OEM to boost pressure and volume to the heater core, especially at idle. You'll probably find that out this winter. More than likely, the DC motor is failing. If its the same pump motor, remove one and use it.

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Thanks,
Mark in NC

"Spark plugs?...We don't need no stinking spark plugs!"
1985 300SD "Der Silberne Schlitten" 420,000 mi


Wish these were diesel:
2003 Ford Club Wagon 130,000 mi