Moin, I have a Cinquecento, 899ccm, without air conditioning, BJ95 the water from the balance tank peeled out as soon as you drive faster than 80 times. The temperature is approaching at the speed then also quite quickly the 130° mark, but also goes down quickly again when you slow down again. I have changed so far: switch f. cooler fan, thermostat, water pump, lid for balance tank. Unfortunately, the problem still persists. Eight, but it gets nice and evenly warm, so it’s probably not clogged. Does anyone have an idea where the problem might lie? Thank you for your tips. Greetings, Ralph