I have a problem with the coolant level sensor. After a minute of driving the temperature sensor on the car starts flashing and also alerts with beeping. 

Of course the coolant tank level is normal. 

The temperature shows 120°C for a few seconds, than it returns back to normal (60-70). As the car is being started for only few moments (max. a minute), this is weird.. 

Following [this thread](http://www.audiforums.com/forum/audi-a3-12/coolant-level-temp-warning-light-49387/) didn't help neither.

I've already bought **a new temperature sensor**, because it was the first suspect for this issue. But without success.

Is there something that I've forgotten? Any suggestions/advices?

![enter image description here](https://i.stack.imgur.com/tOYkc.jpg)