I have a coolant line hose and I am not sure where it connects to. I traced it to a nipple connector thats on the engine itself. its by the firewall on the backside of the engine. a hose goes connected to it and run up to the front of the engine , does anyone know where that hose connects to. thanks

Is it possible to take a pic of the hose so we know exactly what you're referring to?

Most likely it goes to the heater core.

http://www.rx8club.com/showthread.php?t=178937 look at this site and go to the pic right before the last pic, its a pic of the engine u can see the flywheel, there is a black hose on the engine, thats the hose I need to know where it goes connected to. thanks.

This one is connected to the throttle actuator housing.

take the pic down, draw a circle with Microsoft Paint (or whatever other OS uses for basic coloring)

then post it back up.

if its coming from the engine firewall area, it's going to the bottom of the throttle body.