coolant resevoir tank blew a 5 inch rip i relaced it car ran for 3/4 mile ,and

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overheated sat it for 2 hours and was able to drive it home, it starts, it runs but if i drive it more than a mile it starts to smell and steam comes out from underhood ive known i have had an oil leak for sometime but have not had the money to fix it i know its not a head gasket because car purrs there is a rainbow color leak rt under drivers side near tire well any advice?