I cleaned the radiator inside and outside,no air pockets 99% sure,I have bought a new rad cap still no change.Pressure is still present.I will check for bubbles in the coolant tomorrow.
I drove the car up until recently with bad rad cap,that held no pressure,then when i bought a new rad cap I noticed the pressure in the system so i don't know what is "normal" pressure on this TD engines.

__________________
Mercedes W140, S350TD, 95.
Mercedes W140, S350, 92.
Porsche 944, 86 N/A.
Porsche 944, 85 N/A automatic.
Porsche 944, 84 N/A.
Porsche 944, 83 N/A.
Opel GT, 73.
Toyota Supra MA61,84.