Share ko lang with my coolant problem..
Symptoms - silica deposits, more deposits and corrosion, cavitation in the core
Simple test - old coolant 2balls down, new coolant all balls up, stray voltage electrolysis passed
Coolant - Old, 1st flush, new 50/50 mixed
BTW, Radiator fluid cleared only after 3rd flush (dumped it in the garden

).. 5Liters of distilled water still trapped inside engine(i cant locate the engine block drainplug) so i only added 5L coolant concentrate.. Also, drained the reservoir because its contaminated then refilled with new.