The text you've provided doesn't seem directly related to the given key 'mazda rx 8 coolant light'. However, I'll attempt a response based on some general information about cars and their systems.

A Mazda RX-8 is an automobile produced by the Japanese automaker Mazda from 2003 through 2012. The text you've provided does mention that it was developed as part of 'Project 500', indicating its place within a larger corporate strategy or product development program at Mazda during this period.

However, regarding your specific question about a coolant light coming on in a Mazda RX-8, here are some general points to consider:

1. The most common cause for the temperature gauge (not specifically called 'coolant light') to rise in any vehicle is overheating due to either:

- Low levels of coolant/anti-freeze.

- Blockages or blockages within the cooling system preventing proper flow.

2. Symptoms may include a rising dashboard temperature warning, accompanied by unusual noises such as clunking or gurgling sounds from under the bonnet (engine compartment).

3. If you notice any of these symptoms in your Mazda RX-8, it's advisable to pull over safely and consult an authorized repair shop for further diagnosis and necessary repairs.

4. It would be helpful if more specific details about what exactly happened leading up to this issue were provided so that a more precise answer could be given.

Mazda rx 8 coolant light