Hello everyone, I have been trying for 6months but without any luck.

I have a frustrating problem with the temperature indicator in the dashboard it goes up when the temperature of the engine is normal that happens only at night 🌙 🙃.

I have an OBD and the readings are totally fine 91° ~ 97° the engine performance and fans works are fine everything is working smoothly even when it shows that the car temperature is high in the dashboard.
A year ago i have added one more ground wire between the chassis and the engine and it stays fine but in the last 6 months the same problem appeared noting that I cleared all the ground points inside the car or in the engine.

NOTE

1. I have replaces the temperature sensor with no luck.
2. The interior lights slightly dimming when I turn the head lights on.
3. The AC blower on the highest level gets a bit weaker when I press the AC on or turn on the lights. It become normal when I press AC off or turn off the heads up lights.

I'm kindly requesting your support with any solutions out of the box. Cuz I'm losing my mind each time.

Thanks.