Noticed car temperature creeping up from 110F to 120F over the last several weeks. Last night while in a drive-thru temperature creeped up to 120F, fans kicked-on and then steam billowed from radiator. Once home, I noticed a split in the radiator along the seams near the upper radiator hose. Could the split be a result of pressure building up from blockage? Can the radiator be repaired? Thanks for any input!