$1000 Coolant Change

CalG

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A real possibility. Silicate drop out sounds exactly what happened to my coolant. What causes the drop out:

These silicates under certain circumstances (coolant with a depleted additive package (worn out coolant), hard water (water mixed with coolant), high coolant temperature, over concentration of coolant (not enough water)) have a tendency towards ?polymerization?, which can cause silicate ?dropout? or ?precipitation? which can lead to gelation of the silicates in the coolant.

See this site for full info: Radiator Antifreeze Plugging

I am not sure why this happened in my case.

Not a very compelling reference, but an example of "it happens"
 
 
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