OK I fixed it! I used JBWeld. Not a very glamorous repair but very well done.

The neck broke off in two half pieces. I glued them together with JBWeld and let them harden. I then took this assembly and glued it on to the plastic radiator neck where they came off originally.

I made sure the surfaces were VERY clean. I put JBWeld on the mating surfaces and extra both inside and outside all along where the break was.

I let these dry for about 15 hours. I attached the hose, drove through 100 degree weather with the AC on going up 6% grades. The coolant temp got up to 100 C. I feel this was a great stress test.

The repair doesn't leak and seems as hard as a rock.

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)