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Are you the original owner? If a previous owner added a different kind of coolant at any point, especially if it was conventional antifreeze, it tends to react with the other coolant in a way that makes it congeal. Almost like jello.
 

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I am. Nothing was ever added except the OEM spec Mopar coolant at a 50/50 premix.
Weird. Maybe the Mopar coolant just doesn't hold up very well over time.
 
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