If I recall, there may be a difference in ECT temp sensors between FJ62 and 80 series 3FE motors.
I might double check that, and check wiring at the connector?
Just thinking at it.
I've been curios about a similar issue all summer.
My 99 AC has "warm spells" in 90 degree + ambient temps with rear AC on, while at highway speeds, especially while climbing grades or pulling the little off road trailer.
Engine temp at these times is within range.
Evap is clean, new cabin...
Yes!
We abrasive blast and powder coat ALL KINDS of metal projects at work!
Zap an email with some pics through the website and I'll have a look at them tomorrow!
https://powdercoatingabq.com/
Always keeping an eye out for cruiser stuff!
Yes, check cable.
If defective in any way, replacement will help/fix.
They can appear to look good, but not function.
Took me months and lots of adjustments to realize/observe it was faulty.
New cable made it run right again!
Do you have an aftermarket front bumper and a winch?
(Anything blocking lower section of radiator?)
I noticed some increase in temp on my 99 after installing a hidden winch, especially noticeable at certain speeds/MPH.
Not over heating, but higher temps on average when AOT is higher.
A...
There's a cabin air temp sensor right below the key on the panel you removed during install.
If the white hose is not connected to it, it may give you issues like what you described.
Check battery ground?
I'm watching this, as my 99 did something similar a few weeks ago, and hasn't since I wiggled and checked battery terminals...but they did not appear to be loose. Brows are still kinda raised...