FL S8 AQH Overheating issue

[SilverS8]

My FL S8 overheated yesterday when in slow traffic.
It showed 110-120.
When driving it heats up normally and it has taken apx 25-30 min before it passes 90 deg(most likely because i then hit traffic) This is with fan at 75% and max heat on. Took about 15 min when climate on "Auto" and set to 22.

Observations:
- Top of radiator luke warm
- Lower 3/4 of the radiator is cold.
- When idling it won't pas 105 deg with climate on max speed/heat
- When driving at apx 60mph it reach 110-115 before el.fans reduce it to 100-105, Climate on max speed/heat does not manage it to stay under 105 deg like when idling.
- Temp hits 90 deg and stays there for 5 apx 5 min before increasing
- The viscous fan iirc used to operate different, if idling for a while(at 90 deg)and revving you would easily hear it move air(not sure if this spins quicker when hot?) that sound is gone, but it still moves
- The climate produces plenty of heat
- No fault codes in VCDS
- Temp gauge readings match the VCDS reading.

Questions:
- Would there be heat in the climate if waterpump is gone?
- Would a stuck closed Thermostat allow water to flow to the climate?
- Would a stuck open thermostat cause an overheated engine?
- Could i Force the extra electric fan to start in VCDS(not just output test)
- The carrot test, how?

Car has 151000 miles on it. Cambelt/Waterpump and all was changed at apx 125000 miles at Audi(PO)

No time to dismantle the car before Christmas