So, last weekend my lupo decided to overheat to erratic amounts which included me burning my thumb! 1) i drained and flushed the sysem 2) replaced stat 3)when driving it will sit on 90 until you give it some it decides to rise towards the 110 mark, but i put the heaters on full whack it goes back to 90?!?! so im puzzled..is it the waterpump? Stat sensor? Huge air lock? Headgasket? Thanks for any comments and feedback as im missing the lupo as its sat on my drive now