We are reading your words.
Your car is running cooler.

100C - 105C is not normal to me.
Your average engine temperature should be 80C - 90C
You have issues with the sensor, gauge, thermostat or all of them.
Search the topic, the issue is very common.

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ASE Master Mechanic
https://whunter.carrd.co/

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
2003 Volvo V70

https://www.boldegoist.com/