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I have a similar problem. My radiator overflows into the coolant recovery tank, but is not drawn back in as it cools off. I have had the truck almost 4 years, and it has never pulled it back in. I have replaced the waterpump, thermostat and housing (2X), radiator hoses (2X), heater hoses (2X), radiator, and radiator cap (2X). The heater core was replaced right before I bought it (I have the receipt provided by the previous owner).
I can't find any leaks anywhere. The system pressurizes like it is supposed to, but won't pull the antifreeze back into the radiator when it cools off. I'm baffled...
Slonaker
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