im trying to flush my radiator and drain the coolant already in my 91 rx and i can seem to find the bleeder plug for the coolant ?? anyone have a clue the pictures in my book arent helping.. and where it is supposed to be it isnt.

my 88 has it on the top of the radiator near where the upper hose connects. it is a small phillips head plastic plug that by the way is very easy to break https://www.nopistons.com/forums/pub...1047683785.gif

as far as i know on s5 rx7s there is no breather plug,,,,,,,,,, just jack the frount of the car up , fill wiht a funnel let car run with cap off and funnel in,,,,,,,, helps if ya have a radiator funnel wich most parts stores sell for cheep,,,, and the car will bleed itself off. yes s4 has breather plugs s5 does not

If you lose the bleeder screw it's a Mazda only part - $13 for a nylon screw with threads that are difficult to match.

I'm sure that there isn't one on s5. The s4 theromstat housing is alumumin and it has a 2nd radiator cap

and the bleeder plug is right next to it. On the s5 t.h. (plastic) it has no cap or bleeder plug.