Why does my dash say check coolant level but still has antifreeze in reservoir tank

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. The first problem - you cannot use JB Weld or any sealer to fix components. Unless you properly repair the vehicle, you cannot guess at anything other than the things you know to be failed. I recognize there's an interest for perhaps an economic repair, but the vast majority of the time - you'll have to do the job properly to prevent other issues from occurring, or to resolve the issue that is present in the first place. Once you replace the radiator that is known to be cracked, you can purge the air out of the cooling system and restore the coolant to the proper level, rechecking operation. Hopefully that will resolve the concern, but if does not, you'll need to perform more troubleshooting. You may want to consult a shop near you to help -- https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.