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Internal water pump question

  

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I know that some engines have the water pump on the inside if the engine which is crazy. Question....

water pumps have the weep hole to relieve pressure.  How do the internal pumps relieve pressure? The  It seems stupid to have the weep hole still on the pump if it can put antifreeze inside with the oil


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The devil is in the details of the design, for whatever vehicle you're discussing. 


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