00 gxe getting hot

[Dragon_lowrider]

Hows it going everyone, have a question, I have replaced the thermostat, radiator, all the hoses, did a vacuum fill so no air in the system, plus bleed it just to make sure, waterpump is only about 12k miles old, my problem is its starts and runs great, drives fine, until I start climbing a hill, it doesn't matter if I have the ac on or off, ac on gets hotter than ac off, low speed fans and high speed fans both work no problems, I also gutted the catalytic converter wondering it it was clogged, car runs better now but not the problem, I'm stumped, the engine only has about 12k miles on it, it is an automatic, all fluids are in good shape, any help is appreciated

[mdmellott]

Maybe a faulty engine coolant temperature sensor giving you a false high temperature reading. Page EC-136 of the FSM will show you how to test that. https://www.nicoclub.com/service-manual ... 000/ec.pdf
An overload on the engine caused by a number of conditions might also explain it. See page LC-15 of the FSM for possible causes. https://www.nicoclub.com/service-manual ... 000/lc.pdf