For about 2 days during the week I was losing a lot of coolant ie.  Coolant water under car and expansion tank empty.  i filled up with more coolant but then after a few more short journeys checked again & coolant level had dropped right down so topped up again.  Last couple of days been monitoring but there does not seem to be any loss now.  Any reason why there would be such a loss and then suddenly stop ?

 

Thanks

Yes, it's trying to catch you out one day when you are miles from home!