just got this es300 3 months ago.. the heat needle on the dash went almost all the way up to HOT.. got scared so i went to wal mart and get myself those 50/50 prestone green stuff. and put it in.. just today i went to see if i need to put in more in the reserve, there wasn't any liquit in there. there was some nasty brown (kind of like clay) stuff . i remember 3 days before this happend there was some red/orange coolen in there. . could the mud clay stuff be the mix of the organe and green? . oo my god . the guy i bought it from musta never flush it... can my radiator still be save or do i need to replaces the dam thing? any ideas?? i know i need a flush NOW..
used Power flush by prestone. and did another 2 flush with water... the radiator still coming out with dirt.. don't know where the two block drain plugs are, LexBox help me with it. but his 95 ES is different than my 93.

 

i would do a full flush. And then see if your temp goes down. After a week or 2 of normal driving i would do another flush and see if you get clean fluid or a lot of residue. Either way i would start checking into another radiator and thermostat.