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Expansion tank seam split
Expansion tank cap failing to hold pressure
Crossover plastic pipe above the radiator. Brittle and breaks when disturbed
Any rubber hoses swollen due to motor oil contamination
Radiator end tanks
Turbo coolant lines orings
Oil filter housing not repaired properly (bolts not tight enough, damaged or shoddy gasket)
Coolant pump
Loss internally via cylinders
Heater core
Usually it is one of the first half or a few of them
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