Compression Ignition Addict
Join Date: May 2010
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Your logic is good, but the only way to prove it would be to remove the water pump and look.
I think the cavitation issue is due (at least in part) to the radiator cap issue. Cavitation is defined as "the rapid formation and collapse of vapor pockets in a flowing liquid in regions of very low pressure, ". If you lower the pressure in the cooling system (by having a cap that doesn't hold the 16psi it’s suppose to), then you effectively reduce the boiling point of the coolant. Making it possible for cavitation to occur in the water pump where the pressure change between the suction and discharge of the pump happens.
And the less ethylene glycol to water you have the boiling point would be even lower still, making cavitation easier.
Try pressure testing your rad cap and see if it’s holding 16 psi. Then testing your coolant freeze point to see if its over diluted with water.
While maybe not the sole cause for the cavitation issue, they certainly would make it worse.