bora mk4 fan problem

hi:o i have a 1999 bora mk4 gti 1.8t. initially the aircon fan would run but now has also stop. i can drive the vehicle until it reaches the 90 degrees mark and then the engine will cut off and i have to wait 45mins before restarting. i have changed the relay under the battery, the thermo switch on the radiator, the thermo switch with 4 pins and the switch with two pins. there is still no change, that is the both fans still dont work. if you have a similar problem or can shed light to solving mines, please help:1zhelp:

What about doing a fault code read?