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Maybe your overflow is not working correctly. When the system gets too hot it should spill extra coolant into the overflow and then when it cools it should pull it back in. It seems like your pushing it out when hot, then when it cools it can't pull it back in and ends up sucking the hoses flat. Check the overflow for something being blocked, but there's a good chance it's the cap as mentioned. That is definitely not normal.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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