Has anyone come across this?

 

Originally I had a severe coolant leak last summer while weather was hot (empty every few days or so), took it to the garage, on a quick inspection they couldnt see exactly where it was coming from but thought water pump and housing would need replacing. I challenged this as the water pump had only been replaced fairly recently. Anyway, weather got cooler so stopped using A/C and no leaks. I've actually done about 4000 miles and filled it once. Used A/C this morning accidentally on a short return journey while de-misting window and on return journey could see that id left a long trail of coolant.

 

Any suggestions as to what this could be?

H20 and not coolant. It will be the condensate drain from the evaporator.

 

Are you saying that last summer the whole cooling system would empty every few days, that no work was done and the problem went away all on its own? Or were you perhaps just topping up the expansion tank, maybe overfilling or possibly after some engine work where coolant will have been released?

5 hours ago, nick82 said:

Has anyone come across this?

 

Originally I had a severe coolant leak last summer while weather was hot (empty every few days or so), took it to the garage, on a quick inspection they couldnt see exactly where it was coming from but thought water pump and housing would need replacing. I challenged this as the water pump had only been replaced fairly recently. Anyway, weather got cooler so stopped using A/C and no leaks. I've actually done about 4000 miles and filled it once. Used A/C this morning accidentally on a short return journey while de-misting window and on return journey could see that id left a long trail of coolant.

 

Any suggestions as to what this could be?

But had the coolant level dropped?