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Hi iv recently fitted a water temp gauge on my 03 jdm sti and now in traffic I'm watching the temp a lot and have noticed after driving and come to a stop my coolant goes up a a degree a second so it be around 88 when I stop and climbs quickly to 96 when the fan kicks in and it cools back down to 88 is this normal , it just seems like the fan kicks in a lot if I'm in slow traffic
If the JDM model is the same as the UK one, then both radiator fans are controlled by the ECU and will come on depending upon what signal the A/C control module is also sending to the ECU.
It is possible that if enough of your A/C system wiring is intact , then simply pressing the A/C switch may be sufficient to give the right signal to the ECU.
I would have thought the AC would increase temps due to heat soak from AC rad that sits in front of the coolant rad. I know an extra fan kicks in but I doubt if this cools the car better. More load on engine too for the ac pump. Maybe I am wrong.