The rad petcock is on the drivers side of the rad accessing it from in the engine bay, you'll need some rubber hose. I can't recall on the engine itself, it's been a year or two since I saw the lower portion of a 1zz.
i brought up that topic once before. one of the guys said if you want to try to bleed the system maybe you could loosen or disconnect one of the hoses. otherwise there ain,t no bleeder valve.