I would also flush the radiator. If sealant was used to try to stop a leak it usually ends up in the overflow tank plugging the hole to it.
That happened to mine. The coolant could get into the container fine but the hole turned into a 1 way valve and nearly prevented the coolant from returning to the radiator.
The tank overflowed and I got coolant on the front tire...not good when you're running an autocross at the time.
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