Old original water pump have only 4 blades, and its same whats used
on 4-cyl diesel. But theres nowadays out waterpumps with 6 blades,
causing higher water flow. I believe tho at you have air in your system somewhere, blocking the water flow. These are real beasts to remove air from system,
often its just plain luck.
By the way, have you car yet overheated really?
Since, these are like one-shot engines, one overheat, and cylinder head is done.
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