I have a cracked radiator that I plan to fix or replace. I am concerned, though. I did some rudimentary Google research and the general consensus is that I may potentially be replacing parts without diagnosing the actual failure.
Some of what I read suggested that a head gasket failure can cause excessive pressure in the radiator. That perplexed me because my understanding of the cooling system is that is intended to release overpressure into the reservoir.
So here's my question: How can a head gasket failure cause a radiaor to crack from pressure if it's designed to release pressure in the reservior?