Hello Scotty need your help have an 03 element and it over heats while in the Highway in local streets not so bad states up to temperature we have change the water pump twice the thermostat a couple of times just change both temperature sensors found out that one of the fans does not turn on or in automatic I jumpstarted both fans and run it in the city for more than two hours And did not overheat as soon as I go to the freeway in and hit 70 mph it starts overheating I purchase a block test to see if the head Gasket was bad for the test comes negative this is driving me crazy what can I do and thank you for your help
Have you changed the radiator?
Years ago I had a car that was overheating due to what was know as bug-eye-tuss. The radiator was clogged with insects restricting air flow. There was a cleaner that I bought from a HVAC supply house made for HVAC condensers (which is essentially a radiator) which dissolved the bugs. It was a concentrate that was mixed with water. There might be some product to do this at an auto parts store. What ever you do if you have bug-eye-tuss do not use a pressure washer. It can damage the radiators fins. Also be careful with any cleaner spilling on the body. Always test on some inside or non visible area so as to not mar up you paint.