bmw e46 3 series, filling radiator with water nearly every second day, its also over heating.
there is no water leak, heating is working well, oil is ok, no trace of water & oil mix,
COULD anyone help what may be causing it?
Could be a small water leak at the pump, the water will evaporate too quickly to leave much of a trace and as its behind the timing casing you wouldn't necessarily see it.
water pump... had same problem with my benz... water not circulating but boiling and being lost in the radiator vent....thats waht the mechanic told me...solved the overheating and water loss...
i dunno if this helps since we dont have the same car...but i had the same problem...