Toyota vitz 2016 overheating issue

[usmankaka08]

I have Toyota Vitz 2016 model (spider shape)
my car shows red heating warning light when i drive on sport mode or over 120 for 5-10 minutes.
when i show down the warning heating light go away. (Never show red heating warning light with normal driving in city).
- Auto Fan is working perfectly
- Power pump Checked (Working Perfectly)
- Thermostat Checked (Working Perfectly)
- Radiator Cap Check (Okay)

Any Suggestion what should i do next.

Thankyou.

[capsat]

how about transmission fluid change? what is odo meter reading and when was the last time you changed CVT oil in it

[ziaullah08]

coolant level is okay (when last time coolant was changed) ?

[usmankaka08]

vitz 2016 model 2017 import
odometer reading right now is around 66000km

i buy it 5 month back and i drove 2000km +
no idea when the CVT oil changed.

[usmankaka08]

Coolant level is okay.
coolant was changed 2 days ago.

[capsat]

@usmankaka08 in 1st step change the transmission fluid.
over left or right door pillar there is a vehicle ID decal. Read Trans / Axle code something U3XX decode it using google and check for fluid grade & quantity required.

[usmankaka08]

Thanks for your reply.

i just visit the mechanic in my city and he recommend that there is the blockage in Radiator. and he is right, there is the blockage in radiator.
So, Now the radiator blockage is clear and washed fully.

Now there is no issue in overheating when i drive the car over 120+.