u/Brilliant-Shoe-4866

Hi everyone, we just picked up a 2016 Abarth 595 with 104k miles. After about 20 minutes of driving, I’ve noticed a noise coming from behind the dashboard and under the bonnet once the engine is switched off. It seems to be originating specifically from the coolant expansion tank.

The car runs perfectly otherwise the temperature gauge stays right in the middle and the coolant level is healthy (just below the Max line). I’ve already ordered a replacement cap as a precaution, but has anyone else experienced this? Given the mileage, I'm curious if this is a known issue or a sign of something specific.

Thanks!