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I would be looking at cracks in the hose to the reservoir to the radiator . Look for loose fittings. Check that if the hose is in the top of the reservoir in the filler cap that the pick up line is to the bottom of the bottle and not cracked . What you have is air getting into the line when the vacuum from a cooling engine starts to work and that prevents water being sucked back
First remove and check the bottle for cracks in the bottom and sides . Have a coolant system pressure test done and have a compression test done for head gasket and cracks. Have the radiator cap tested for correct operation
flushing a radiator is a waste of time and money as blocked cores do not flush. Have a pressure test done on the coolant system and check for external leaks. have a compression test done to check for head gasket and cracked head. Have a flow test done on the radiator and if shows signs of blockage replace the radiator .. Always fill the radiator at the radiator cap and not the reserve bottle. The reserve bottle water will not go down until the engine coolant starts to cool so if it is going down when the engine is hot then you have a bad leak in the reservoir bottle.
If the radiator is leaking, put a bottle of radiator stop leak in it,fill it up the rest of the way with water, tighten cap, and run in idle for 15 to 30 minutes. If the leak is severe or one bottle doesn't work, use two bottles of stop leak and run for 35 minutes.
If it's the radiator cap that's leaking, replace the cap with a new one. Also check to make sure there are no loose cooling hoses.
Safety first: Use extreme caution to never remove the radiator cap when the engine is hot, severe burns from escaping hot water could result.