General causes of overheating.
Most common issue's.
Radiator fan is not functioning
radiator cap is faulty
Brakes are jammed
Bad Engine oil/ very thin may be 5W20 or over usage of oil millage
1.Coolant related issues
a. start the car when not hot may be in the morning.
b. open the hood.
c.remove the lid of coolant radiator or resorvior.
d fill it up to the top
Are there air bubbles appearing in the water?
are the bubbles tiny and constant
or Are the water bubbles big and constant
a bubble appears every few second.
If there is no bubble Your head gasket is fine
If the bubbles are constant and tiny there is a leak in the head
If the bubbles are Big then there is substantially leaking head gasket
If the above is not an issue then.
Check the lid of the radiator It has two functions , on running it lets the water go to reservoir On cool down it lets the removed water sucked into the radiator , any of the two functions can cause reduction of water eventually heating up.
Does the fan work and cick in at temp above Normal operating temp Observe the fan.
Radiators need to be opened and cleaned up , there are a few pipes blocked if you are using tap water. When was the radiator cleaned from inside This could be the cause.
Jammed breakes cause stress to the drive train check the 4 wheels for any of the two jammed , or after driving 3 km touch the lug nuts and see how hot are they
Your grade of oil might be 5 W 20 which is meant for 0 meter cars only you need grade 20W50 and change it every 2500 km without fail.
I would suggest that you get your radiator Cleaned up from the interior and enjoy the luxury of this car.
Do take the temperature issues serious . Why don't you get in cabin temperature gauge installed Some place that it does not gives a bad look. it will give you exact status of the engine temperature.