All I can say is :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek:
Hope the above is "explanation enough"
Your coolant is NOT protecting the motor and has most probably turned ACIDIC :( .... Change & flush it now :mad: ... Your suppose to do it every year (depends on brand)
Mike
:(

