Oil pass to the VW Vent refrigeration system

I have a VW Vento, the oil is passed to the refrigeration system Brush the butt change the packaging of the same is cheko the oil cooler was made hydrostatic test and the problem persists you are no longer I know what to do more thanks for the help for the help

The cooler was checked in hot because the fissure will not expand

The cooler cancels before doing anything else and proves is true about dilation, but it would be good to do a hydraulic test to the butt, if it does not improve me you will have to check the state of the motor block, in addition the quality of the cylinder head packaging is very important as well as the state of the bolts, what are you giving it?

Thanks to all the forists especially Kikemec changes the oil cooler and problem solved a hug to all