My 1987 325 with automatic transmission had an ATF tranmission oil cooler line break inside the radiator. I replaced the radiator and the problem was fixed and cleaned out the radiator but now how do I clean out the bad fluid in the radiator which is mixed with coolant? I tried draining the trans oil several time from the bottom of the sump but it still looks contaminated with coolant several times after refilling and draining the ATF. Some mechanic offered to do it with "special machine" that will suck it out for $400.00. Ouch! There must be a cheaper alternative. Maybe just keeping changing ATF oil 5 more times. Do I need to drive it a bit before draining it to get the oil out of the torque converter?