My 2003 Jeep Liberty 4WD radiator blew again after I had changed it for the same reason about 4 months ago. The first time I thought maybe it was a defective radiator (1st one was in for about 7 months) so I switch brands and now it did it again after a few months. The vehicle didn't say it was overheating or gave any notice. Would there be another reason beside a defective radiator that would be causing this? Both times there was a pop and coolant started spewing everywhere. Both times it was while parked and idling for a few minutes after driving to my destination. The pop was the radiator cracking along the side.