Same here.
Always rises to 90 then stays there .... apart from when I had a coolant temp sensor fault (when the needle stuck at zero), and the time I lost all of my coolant while right-footing it down the motorway (causing the gauge to move up slightly).
I wonder if your thermostat is sticking a little, or opening late. It's possible the Radweld is responsible if that's the case, especially if it started happening just after that.
Might be worth checking the temp with VCDS (assuming VCDS can read the CTS temperature - never tried it myself) just to confirm whether the ECU is seeing the same temperature the gauge is reporting ... though I suspect it will be.
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Mark
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2002 FE S8 Ebony Black Pearl
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Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)
The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
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