Re: Foam in Anti-freeze
Cavitation is where something moves through water fast enough to form a pocket of vapor. The vapor collapses as soon as the object passes or the water passes. I doubt that the water pump blades would move fast enough to cause cavitation. Most likely the water pump is mixing air into the coolant and there is something in the coolant that acts like a soap solution to support the air bubbles. It could be oil but it could be anything such as left over cleaning solution or bad coolant.
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