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1.4tsi fr thermostat read bouncing around 80-90

Jan 31, 2024
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Hi, my 1.4tsi fr Ibiza (2015) is coming up to temperature as normal (thermostat dial accessed through garmin Satnav).

however I’m finding whilst driving in almost any circumstance, the dial is fluctuating between 80-90 degrees, but never sitting still at 90.

when upping the Revs it rises and will stay on 90 whilst I’m driving hard and maintaining speed, however when I slow down and the Revs drop, the needle drops too, and then fluctuates between these two temperatures.

is this something I should be concerned about, or could it be the case of a faulty sensor?

thanks in advance