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Answer:
I think the aircon does not do anything with the overheat. vehicles are designed to run normal weather aircon is turned on or off.
Check your engine's cooling system which comprised of raidiator, fan, fan motor relay switch and temperature switch.
When cooling is not doing the job, you will not noticed this when you are running on the highway because your speed relative to the air cools the radiator. during traffic, no air is flowing so engine gets hotter and hotter. If you'll turn on your aircon, the time your engine overheats becomes shorter because the engine has increased its load.
Kia's cooling system control is very simple. the circuit is composed of:
1. fuse
2. relay switch
3. temperature sensor switch
4. Fan motor
which means you'll only have to check 4 components.
When your aircon is on, radiator motor fan does not run continuously because it has a separate control.
The load attributed by the aircon will be sensed by the temperature control and thus run the radiator fan but not continuously.
Hope it helps
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