I wouldn't fix the jar, just buy a new one. A crack, though rare, could possibly harbor bacteria. You could try using heat and melting it, but it wouldn't work as well. Your jar may still be under warranty, call Blendtec at 801-222-0888
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Check the blade assembly if it is loose tighten it up. If it is worn out or cannot be tightened up then buy another jug complete with blade. If it is the glass jug model then the blade assembly is available without the jug and they also have a replaceable seal at the base.
What you need to do is turn them by hand each time you use it, before you put your food in. Sugars and other deposits are often left around the blade assembly when you mix smoothies and stuff. Often this sugar is difficult to clean. Turn them by hand first to break the sugar molecules, then when you are done I would add 2 inches of water and a drop of soap. Run it for about 20 seconds and rinse. That should help the next time you use it. It also helps to use it daily. It keeps the molecules from hardening.
Common issue with all of these carafe's. Once the jar starts to leak the bearings are shot and it is time to replace the jar. The bearings are non-replacable. Bad design in my opinion. I was able to get my last jar (I have been through 3 before the 5 year warranty went out) to last by hand washing and not putting it in the dishwasher, but after 4 years of use on this jar it failed too.