[steve25]

Has the overflow been going into the tank at all?
If you had the rad cap off you may try burping the air out.
Start the motor with the rad cap off and wait for the stat to open, as it does let the rad over flow some and put the cap back on and drive it to kook for any change for the better.
Also not that you should note use tap water in the rad along with coolant, you need to keep minerals out by using denatured water!
If you used tap water I would drain the system, use a can of two part type flush and start over with the right water and amount of coolant, meaning no more than a 50/50 mix for summer and than follow the coolant flow thru your rad with your temp gun.
I would also remove the oil filter, cut it open and check for bearing material in it just to be on the safe side!