I bought this car with the bad radiator with the tranny fluid mixing with the coolant. Wouldn't move upon purchase, flushed tranny, worked perfectly. Drove it approx. 1000mi and the tranny starts slipping or not engaging in the higher gears. I flushed it again and got about 100 mi out of it before it started slipping again. Car has around 170k and I have a used tranny ready to install. I would like to know how to check the trans fluid before swapping. Are you supposed to check the atf with the engine running with the ebrake on and trans in drive, like my wifes passat, or just check it with the engine running. Please help because I am on a very tight schedule.