Cooling system - Common problem
Based on the symptom you have mentioned.
- Check if any fault code from scan tools
Car is overcooling when running condition
- Thermostat (struck to open position)
- Electrical cooling fan (always on)
- Thermal / coolant temperature sensor
Car is overheating when idling condtion
- Electrical cooling fan (defective)
- Thermal / coolant temperature sensor
If all of the above components have no problem, you may need to inspect
- Engine Control Unit Internal Fault
- A/C refrigerant overcharging, does your A/C still work when the car overeating in traffic jam?
Kancil - Radiator Problem?, Temperature up more than half....