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where is my coolant going? 1800

posted by  Fredneck Tom on  Fri Oct 21 06:00 CST 2016
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Don't understand how it can idle for 30 min. and not overheat, yet in the same time or less driving 15 miles it loses enough water to overheat.
Have you run the heater at full bore? Maybe an air pocket expanding and forcing water out.
Does the IR thermometer indicate that the block and head are evenly warm or is there a hot spot?
Is the radiator cooler at the bottom? Does the bottom hose calapse at higher rpm?
out of ideas for now. Tom






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