Hello again vw people and fellow mechanics, well this is a follow up to my earlier question about my?

Golf 3, 1993 model, diesel radiator fan not working. Now, with a light tester I conected the positve terminal of the battery to the Fan negative wire and i got light, I then connected the positive terminal of the thermoswitch socket to the negative therminal of the battery and i got light, I then bridge the thermo-switch connector red wire and the red/black wire and the fan turned ( I have changed the thermoswitch yet it did not work) I then bridge the thermo-switch connector wire to the red/white wire and i got a blown fuse. Again, when the fan turns it makes little squeaking sound and its turn couples of times freely and it will seize, when i turn the blade with my hand it was stiff as if its binding. I suspect the fan is bad and has broken the new thermo-switch; Doe any one have Idea what I am missing or needed to be done before I change the fan and thermo switch? and did the fuse blow as a result of wrong connection or its normal or the high speed system is causing the entire prob?