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Hello kendra_l_bon and thank you for asking your question, on Fixya.
Here is a simple process that will walk you through a few steps that
will pinpoint the overheating problem on your 2003 Honda Civic,
without even using any tools. It has helped millions of people, and I am
certain that it will help you, because I wrote it for people in your exact situation. How to diagnose your overheating 2003 Honda Civic
Follow your fan belts. One of the belts operates the power steering unit. The resivor should be right there with the power steering unit. It is best to check the level when motor is cold. If it has gone completely dry then you will need to get the air out of it after adding fluid. To do this you add the fluid then turn the steering wheel all the way to the right and then back to the left several times. After the steering wheel feels smooth while turning it then you are good to go. Recheck the fluid first after you have turned the steering wheel back and forth and top it off to the mark on the level stick. Hope this helped, raz
Check fluid level when vehicle is cold.When it starts to overheat open the hood and make sure the radiator fan is blowing.If all this is OK then your thermostat may be bad.Look under the car when it overheats for leaks also.