Antifreeze can comein any color (green, yellow, orange, red, etc..). Just because it looks fresh dosn't mean it is. I have never heard of blue antifreeze, maybe the previous owner put in an addative to it that made it that color? I would just flush out the system and start with new fresh fluids. With any used car you get it's always wise to replace all fluids and start fresh so you know when how old it is and will know when it's time to change them again. There is a tester you can buy that will test the antifreeze to see if it's still good using a Hydrometer. This will test the strength of the antifreeze. There are a few types such as one squeeze a rubber bulb to suck some antifreeze into a chamber that has a meter on it (nothing fancy, no electronics just all plastic pieces) and the other are test strips that you dip into the antifreeze and they change color to determine the strength. Steve --- In dmcnews@xxxx, "vin4258" <vin4258@xxxx> wrote: > Does anyone know what color the factory antifreeze was? I was going to change mine since I don't know if it ever has been, but it looked fresh, so I put it back in. It is blue but I have never seen blue > before (or heard of it.) If it is original, do I still need to > replace it even if it is clean or not? > Thanks > Cam