I'm thinking this is just a case of poorly mixed coolants, the snot globs that were in the tank didn't seem super oily, and were a bit brown for what I would think is oil in the coolant (but then again I am used to diesels). I flushed the system with lots of water. The overheating seems a bit better, but it is still too hot at idle with the AC on.
Fan clutch is working. Electric fans are working. Air coming off of the radiator is hot (at least out of the top of the radiator). I pulled the radiator back and looked between the condenser and radiator and it wasn't full of junk.
One thing I did notice when flushing was that the water I initially drained out of the radiator drain was cool. I had run the car up to temp, and the water quickly got warm. Looking at the hose arrangement the lower hose comes out of the radiator about 1/2 up the tank. Could a baffle inside have come loose
I used an IR temp gun and got 210*F at the upper hose and 173* at the lower hose with the AC on. Should the temp drop be more than that?
Very puzzling. Temps are fine when underway, it's just when stopped or crawling that things get too hot.
-J