Recently bought a 1990 Jeep Cherokee in very good condition. I was advised right up front that with it's inline 6 engine type space was really small in the radiator area and it ran hot. I have noticed it climbing upwards of 210 (per guage). I do not run the air conditioner even though it is equiped. Is there anything I can do to decrease the temperature? It has a single chamber , metal radiator currently with the pressurized "closed" system. Everything appears to be working well, I just do not want to take a chance of doing major damage if it were to overheat. Advice?