I had the plastic L shaped piece going from the manifold to the belt tensioner blow/break off (no where to be found) while driving. When I went to the parts store they had 2 different types. One made out of plastic and one made out of aluminum. Obviously the aluminum one would not do the same thing again but here is my question. Is that piece meant to be a weak point so damage would not happen else where? It was replaced about 6 months ago. I'm not sure what would have caused that to happen to begin with. Stuck thermostat building up pressure?

Any thoughts would be appreciated.

Thanks

Kurt