Hy!
Yes, number is 23! It have two parts! And I must be change main thermostat. (CAHA,CAHB, CAGA,CAGB,CAGC)
1K0121113A
1J0122351
All problems are solved!
However for the facelift model the temperature drop does not always resolve there. (CJCA,CJCB,CJCD,CGLC etc.
Part number is another. I attached the picture! The valve is hidden in the pipe.
1K0121113A
3W0122351 (Facelift model) 2012-......
There is always something fault with this.
There is a 50% chance of it.
Best regards,
Tamás!