Radiator leak - Volvo. Pls help

I have a coolant leak from top of my radiator, driver side. The first picture with the blue circle is where it would accumulate. Truck is a 2014 Volvo with d13. The first picture shows where it would accumulate. I am loosing about 2 litres every 700 miles. Took it to a mechanic and he did pressure test and after a hard time said a hose was leaking. Hose replaced and leak is still there.

Today, I washed the engine compartment and idled the truck for upto 2 hours and found coolant accumulating in the area that is circled (within one of those squares). Seems like it leaks more when under load. Is there a product I can use for temporary fix?

Any other suggestions?
Pictures
20190706 160217
20190706 160234

 

20190706 160234

 

I did what you said and nothing has changed. I will look at it again when cool and perhaps drain out the coolant first. Now that i think about it, this leak started a few weeks after i replaced the reservoir.

 

This might be the problem with mine. I will apply some jb weld into one of those squares. I cant seem to see any crack with my naked eye.

 

I actually did get a code for thermostat a few times before. It came and went and for the past couple of weeks I did not get a code. Does a bad thermostat have to do with this leak?