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Originally Posted by ke6dcj
it looks like the rear hose from passenger-side block to heater-diverter valve (124.830.54.96) or the metal elbow that bolts to the block and gives it a nipple is defective.
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Yep, it was the rear engine hose on the passenger-side (USA) of the engine block that had a tiny slit, that was slow enough to touch the HOT engine and vaporize the coolant while driving.
BTW, about 2-months later, the other rear engine hose on the driver's-side that goes to the heater core, also had a small leak.
All is fixed, along with a new waterpump, thermostat, thermostat by-pass hose, waterpump to intake manifold hose, and lower hose.
:-) neil