1998 Other Saturn Models

My saturn was leaking anti freeze and I had to keep putting it in about every other day then one day the car started overheating and smoke was coming out the back I brought it to a mechanic and he said there was oil in the anti freeze reservoir he put in a new water pump cleaned everything up put in new anti freeze and new oil I started to drive the car and the red lights came on again when I got home and looked inside again there was oil in the anti freeze reservoir and I had some smoke coming out the back again I was hoping that there would be a quick fix for this problem just for awhile I just need this car to get around town no long driving I hope you can help thanks