98 A4 V6 2.4

Mileage at 43,000
On very cold mornings (frosty -5c) my coolant temp warning (thermometer over rippling pond) comes on for about 5 miles.
Rad reservoir is at correct level, fanb belt fine, water temp comes up to 90C, no bad sounds from anywhere and no problems. Engine runs smooth.
Could it be a sender (electrical) problem
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