You have to have a thermostat in the system. Have a compression test done to check for head gasket or cracked head/s. Check the flow rate of the radiator ( blocked cores) check the condition of the cooling fins on the radiator. Check the radiator cap. Check if the fan is working when hot.. If you have a viscous fan hub on the fan then replace it . run the fault codes to check for air/fuel problems . Check for load and speed conditions as high speed when fully loaded will cause your problem . Check that it is actually engaging over drive and not over reving the engine.
SOURCE: ford ranger truck overheating
I have had this happen with my ranger. Changed everything I could to try to fix the over heating. It turned out that I had a small leak in my head gasket and it was allowing exsaust gas to go into the cooling system witch was over pressurizing it. Also the air from the exsaust will heat up much faster than liquid making your thermostat to read hot and will not be able to blow hot air in the cab because there is no liquid going to the heater core. This happened to me when my blet came off and I tryed to make it home. If you had it over heat for a long peirod of time it may have ripped the head gasket.
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