i have a 95 z28 camaro. i am having problems with my radiator. the radiator had a hair line crack as long as two inches which would squirt out anti freeze once pressure bulids up. i firgured out that i needed to replace the radiator. so i replaced the radiator with a used one from the junk yard. i drove the car for two days and the radiator started to leak again. if i did not know better. this different radiator had the same hair line crack in the same area. i check the radiator out before i purchased it. the radiator was fine for the two days i had it in the car coolant level was fine. now my question is what can cause both radiator to crack in the same spot. do i need to replace the thermostat, the radiadtor cap, or is it something else. i am going to buy a new radiator.

 

when i fill my radiator to the filler neck it drops below the filler neck. is that normal.

 

Are you for sure that the crack was in the same spot? Also when you put the radiator back in did you use the bleed screws and make sure there were no air pockets? If there were that could have been the cause. It happened to me when I replaced my heater core, I kept leaking coolant and didnt know why, turns out there was an air pocket in the system and it was causing the car to heat up and coolant to overflow out of the cap.

 

Get a new cap then too.