As far as the power steering goes, if after the refill, the fluid hasn’t all leaked out, and the steering feels good, and the fluid doesn’t turn black, then you are probably ok. I assume it wasn’t actually empty, otherwise you’d have know all about it as steering at a standstill or at low speed would be very tough. Clean the rust up in the boot and stick some inhibitor on it (Kurust or similar). Then keep an eye on new ingress. If water does appear, check the boot seal first of all. Can’t really help with the ticking on start up. Not familiar with the is200 engine. Given the power steering was so low, it doesn’t particularly indicate good maintenance by previous owner, so a good service is probably in order. Oil and filter change (and maybe a dose of flushing oil as well) might help. Sent from my iPhone using Tapatalk Pro