Cooling system problems…

So I now have the following problem: My Omega B MV6 BJ:1995 3 liter caravan…. First of all it is said that I love my Ommies above all and do everything to keep them alive… However, I now have the following problem. I have (must) renew my oil cooler, was not the problem since cheap new ones got stuck in, etc. however it is now so since almost all hoses tried to get rid of the oil water mixed…which was not soo easy…naja on ever the case I had to e.g. the hose (I stand in front of the open engine hood) which goes to trim under the intake shafts above the water pump and from there to the cooler, to get free all my lung force to get this thick oil sludge out of the cooler. that was so hard to push out there, I thought the lung bursts, well when I blew in it came out of the hose that would go to the secondary water pump. after that the GROBEN mud… from the other hatches first, what do I take best to get my cooling water system completely oil-floating again and the second thing what do I have to expand everything to replace the water pump…I don’t know anymore because I didn’t pay attention to it now or just don’t know for sure that the water pump can break through the oil-water mixture so that it pumps more garkein water? so fact is completely broken?? and to conclude whether the te mparatursensor for the vedntilators for cooling water is only the one in the coolant bridge over the oil cooler or if there are even more that regulates this?? because had it run yesterday but the fans don’t jump on, did today the coolant bridge (over the oil cooler) plus built-in parts clean it should have been because it should have been it, I’m not sure but didn’t the directly on the cooler still feeler that regulate the jump of the fans??? yes somewhat cumbersomely written sorry, but who doesn’t mind simply not answering/no non-themed reviews… otherwise really thanks for your trouble…