Hi folks, I'm due to change the thermostat on my high mileage 2001 avant (awx engine), and think draining/flushing coolant may be a good idea. However having looked at the coolant (i se-ringed some out of the header tank), i'm a bit confused as it's completely clear as water, it does smell and taste of coolant though. Anyone seen clear coolant? Question is kind of academic as I'll be refilling with G12++ within the next month, just confused as to what the previous owners/garages have been chucking in there.... I'll hopefully be back with less stupid questions in due course.