my passenger side on my truck is leaking water again on the carpet. It has happened before and my heater core was no good and it ran hot and even cracked my heads. So i got my heads replace and replace my heater core, but today after work about a month later i noticed it was leaking again and i just got a brand new heater core put into it. whats going on im worried it might crack my heads again if i run my truck hot due to my heater core. is it cuz of my thermostat is no good and its causing my heater core to mess up or something. i bought a new thermostat but i havnt had no time to replace the old one....