Bet the new fan clutch solves your problem.
Read the entire thread, Did I miss a part where you CONFIRMED that it's not a head gasket? Did you use a 'funnell fill' when adding coolant? And you ran it for a while to completely purge the Air. I have a 2.3 in a Sport and idling, even with it on ramps to get the front up it still held air. I had to run it for a while at 2500rpms and then the bubbles FINALLY came out. Idling, even on ramps won't purge the air. Reading this and all you have checked, and not 100% ruling out the head gasket with a hydrocarbon test is putting you where you are now. frustrated.Yes Phil. Thermostat is in correctly. Even though I made sure I had good flow through the heater core and I can seem to idle all day in the garage with good cab heat and only overheat and lose cab heat on an actual test drive, my next test is to bypass core to see if it only clogs under load.
I'd much rather change a head gasket than take apart the dash though.
Yeah, still trying to break that habit.don't forget bandaids and good selection of swear words, you will drop at least 2 nuts.........