Volvo XC70 p3 D5 awd aut coolant loss

[juge]

Hi,
My XC70 d5 awd automatic yearmodel 2011 has begun to leak its coolant. Leak is located to the rear of the engine (viewed from front), left side (viewed from rear), and coolant comes between engine and gearbox via left side lower engine bracket to the ground.

Leak is slow and no even what so ever. It may take day or two that it does not leak at all, or it may leak just in two days as much that I have to add coolant to expansion tank. Engine has lost coolant over the time but very, very little. Over the last year which I have owned this vehicle I have added only once or max twice the coolant. This bigger coolant leak begun at last week while here was the coldest winter in long long time, over -30 degrees Celcius.

Yesterday I removed battery box and air filter box, and nothing obious leak point. I checked with endoskopecamera rear of the engine and firewall but nothing. Only thing which I was able to confirm that the coolant leaks to the bowls of the lower left engine bracket and from there it comes to ground.

Any ideas where that coolant comes from...?