Most transmissions are cooled using separate tubs in your radiator, if this tube develops a leak it could mix with your antifreeze, you need a new radiator...
You have a leaking transmission cooler, usually part of the radiator. The transmission fluid is mixing with the antifreeze turning it pink.
You have a failed radiator. Most vehicles have a trans cooler on the side of the radiator.
NO!!!! do not do this, oil is oil, transmission fluid is transmission fluid, and antifreeze is antifreeze, do not mix any of these, it can perminately damage your engine.
the cooling tank in the radiator for the transmission is bad
Transmission and antifreeze.
The transmission cooler (possibly part of the radiator) has failed
Water or antifreeze.
From the transmission? No? But antifreeze & transmission fluid can mix. Your transmission uses a small portion of the radiator as a transmission cooler, normally at the very bottom or side. In very rare instances, this cooler can develop a leak and allow transmission fluid and antifreeze to mix together. The only fix is to replace the radiator.
The trans fluid will take on a pink, milky look.
Oil, Antifreeze, Power steering fluid, brake fluid, transmission fluid, coolant...
The antifreeze/water mixture is too weak for the conditions or you have engine oil or trans fluid mixing with it
If it is motor oil in the anti freeze, then it is either a cracked head, cracked engine block, or a head gasket blown. If it is transmission fluid in your antifreeze, then the radiator is leaking from the transmission cooler ----- although usually that would cause antifreeze to be in your transmission fluid.