Usually they will explode
a) cheap quality parts
b) air in the system
a)you can't really do much unless you go with a diff unit (or one thing i have learned when sometimes they don't crack they POP out(the plastic end tanks is that 2 belt or 3 will keep them firmly intact
b)minimize the air in the system(never leave it up to dealer to check)
if you have only water no spaces it can evaporate...
if it does that air will increase the pressure tremendeously and POP you have one...