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CSF 3 row, all-metal . Seemed like quality OE spec. unitSo which radiator did you replace with?
Can you narrow down the symptoms a little more. You say its OK at highway speeds but not when you are working the system. Can you confirm if the same issue happens with the aircon off as well as on.
* Does the radiator cap seal properly and open properly at 12psi?
* Check the input and output temps of the radiator
* At about 180-190 can you see the coolant start to flow? Stuck thermostat?
* Trans fluid level? Dirty?
Right now shooting clouds in the sky. As noted before, it could easily be more than one thing.
Symptoms: Normal road conditions without A:C - no issues around town, in traffic, or highway. When off-road in deep sand (tires aired way down) and running moderately hard the engine temp begins to climb rather gradually above normal operating temp. and will get really hot if I don't stop and let it idle until it cools a bit. When towing small utility trailer (less than 1000 lbs) it will do same things. Climbed Mt. Washington auto road earlier this year, gradually got hot , had to put both front & rear heat on to stay cool. Hot summer days w/ A/C , runs fine until stuck in traffic - then A/C temp cutoff shuts down A/C. Couple mins. w/ A/C off and engine cools enough to use A/C again. There's never been a run-away over heat issue, it's gradual - like cooling system just barely can't keep up w/ heat production.
Did it run hot under load before you pulled the engine ?
Did the head gasket blow or did you do this work as a pm ?
How long have you owned it ? Does it start, idle and accelerate like it did before the engine was pulled ? Do you notice the change in fan speed as it starts running on the hot side with it idling and a/c on ?
Lean condition , vacum leak, will cause hot running condition, also as noted above ,ignition timming will too.
Have you connected a scan tool and checked temp. , o2 readings ?
When head was off, cylinder walls were pristine- factory cross-hatch looked like it was done yesterday. One of the piston tops was steam-cleaned, that was it.When you had the head off did you notice any scoring on the cylinder walls?
Nope - Completely new exhaust system , no CEL, no codes