Got it ,was the high pressure sensor,couldnt see it , hard to put it back on without to look,but yay.
thank you so much,everything is working just fine.

havnt found it yet, on the housing of the thermo is a plug already, and the fan has just one big connector on top

Hi there, I replaced the radiator yesterday on my xc70 25t 2005,everthing went well so far,but I have a harness or cable connector which I cant put back on because I cant find where it has to go,should have taken photos before started it . Now the cooler fan is running high speed as soon as I start ...