RX8Club.com - Red Sign of Raditor in my RX-8

It's your Engine Coolant Level Warning Light.

I know English probably isn't your first language, so I will try to keep it simple.
I also need to be careful about what I'm about to explain to you and how I explain it.

You first need to make sure your coolant level in the coolant bottle is okay, there are marks on the side of the bottle that are hard to see, but that will tell you that your level is okay. See the below picture for where the marks are.

https://www.rx8club.com/attachment.p...1&d=1299041552

If the level is NOT where it should be, the car is running hot(does the gauge with the needle sit about where it normally does?), then the below won't work for you and you need to find out how you are loosing coolant. Do notgo to the next steps unless you know that you are not loosing coolant, and your gauge with the needle is okay(usually about 2 marks to the right of center.)

If the coolant level is okay, then you are most likely not having any leaks.
If no leaks, then there is a float inside the bottle that tends to not float anymore when it should be floating and this causes that light to come on.
It's a known problem in this car, but to really cure it, you have to buy a new coolant bottle.

However, if you are okay with checking your coolant level often, then you could unplug the sensor at the connector beside the bottle.
This will turn the light off, but then you would be responsible for checking your coolant level often and you won't get that warning light should you have a leaky hose or something in the future. See the below picture for the connector to unplug.

https://www.rx8club.com/attachment.p...1&d=1299041552

Again, you really need to make sure that you have the proper amount of coolant and have no leaks or other problems before just unplugging this sensor.

Hope I explained that well enough.