I had a coolant leak I thought because I would have to fill the fluid every so often. But, when I went to fill the coolant today I got the bad news and saw transmission fluid in the coolant which I guess is a failed radiator. My question is what is the best way to flush the tranny oil out of the engine and the coolant? Just keep pumping water through it for a while or something like that? I am familiar with doing the transmission flush so I am good there just have to drop money on new fluid . Not good news but I guess I shouldn't have bought the cheap radiator off of ebay.

 

Oil like fluids, engine oil/trans fluid, in the cooling system can be flushed with dish washing machine detergent. Several flushes of detergent and water may be necessary with a few final flushes of straight water to get the soap out so you can put coolant back in.
The bigger problem is oil exposure to the rubber components in the cooling system. Hoses, thermostat seals etc can swell with enough exposure to oil. You may need to replace these types of things.

 

I never thought of that that is a good idea. I will do that and I never really thought about that but your right the oil isn't good. Hopefully I caught it early enough to get it flushed out and fixed.