I've got a 1988 528e. The plastic nipple on the top right of the radiator (that connects to the vent house going to the expansion tank) has broken off. I've seen repair nipples for other models, but not this one. Has anyone tried them? Could I thread a metal male NPT-to-hose-barb adapter into the plastic of the radiator tank? Would this hold?
Thanks for any advice.
-aj