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Guri,
You may, as a stop gap measure, patch the crack with some epoxy putty (Marine Patch etc.) or JB Weld. When the rad is cool open the expansion tank cap to release any pressure in the system, clean the crack area with some alcohol, scuff the surface a bit with 80 grit sand paper, wipe it again with de-greaser solvent or alcohol and apply the patch and let it cure. That should help reduce the chance of a larger failure until the new rad arrives. It would be a good time to replace the T-stat and expansion tank cap as well the rad and hoses. Good Luck.
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