Mirror heaters not working, dealer unable to find any faults

Stay on high idle wont come down rpm

Engine idle high
Wont settle down
No lights come on dash
No problems shown on dash

Coolant leak behind the turbo assembly

Since I iwn d the car it has list coolant without any external evidence. Ansovthere is no evidenc in th engine oil. Dealer replaced coolant recovery tank but no change in loss. Seems like about half a…