i took my car to the shop to get my radiator fixed because there was a crack on the top. so i got my new radiator and in a day or two, the radiator has a crack in it. the temp gauge will go up and my AC will turn hot while i'm stuck in traffic or when I'm looking for parking around school. i open the hood and coolant will start to come gushing out on top of the radiator sometimes. I goto the shop and replace it.. in a few days it happens again, so i told them to change my thermostat. they said they already did and they replaced the radiator again. same thing happens. there aren't any leaks other then the radiator crack and i change my water pump about 10-15,000 miles ago. any suggestions or comments? thanks.

oh and i believe this is an all metal radiator i'm replacing it with.

oh and fans work fine.