Sounds like a cooling fan problem to me, since the temp rose when idling and dropped once you got some speed again. Maybe the fan or it's contacts are broken, hardly the fan controls - but you never know with fiats.
Thermostat is a another possibility, or low coolant level.
Be sure to check the coolant level every time you go for a ride a watch that temp like a hawk before you find the problem.
Thermostat is a another possibility, or low coolant level.
Be sure to check the coolant level every time you go for a ride a watch that temp like a hawk before you find the problem.
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