No it is not necessary.
The 2 lines that come from the transmission and go to the radiator are full of transmission fluid and the radiator is what cools it.
if you have an automatic transmission there should be cooling lines going to the radiator to cool the transmission fluid the lines could be leaking or the tank could be leaking
Vehicles with an automatic transmission may have lines that carry transmission fluid from the transmission to a separate tank on the bottom of the radiator.
if you are asking about the cooling lines for the transmission that connect to the radiator, its easy. first disconnect the lines from the radiator (2 lines, usually on the bottom opposite the radiator outlet) then disconnect the lines from the transmission. remove the brackets holding them on, then remove.
No, just check the fluid level with it running in park and the lines will self bleed.
Most of the ATF will remain in the trans cooler and lines unless you have the transmission force flushed by a trans shop.
I had a similar problem and ended up replacing both the lines and the radiator.
the problem you arehaving isn't with the transmission its with your radiator it has a crack in the side where transmission lines hook to you need a new radiator and id also do a complete transmission flush to explain whats it is your coolant is mixing with the transmission fluid in the radiator replace your radiator and you problems are gone after you flush the transmission that is id do that before i put the new radiator in if i was you
Most likely it's automatic transmission fluid, check to two metal lines going into the bottom of the radiator to confirm this.
It doesn't matter which way the lines go back on as long as your not putting too much stress on them. The transmission fluid can flow through the radiator in either direction.
You will notice two lines going to your radiator from the transmission. One is a service line and one is a return line. The radiator has a transmission cooler built into it. If you have trans fluid in the radiator chances are the trans cooler is leaking. A little trans fluid in the radiator will not affect engine cooling BUT as soon as the pressure drops in that transmission you may very well have radiator coolant sucked into the tranmission and that will ruin a transmission in a hurry. You need to get this checked out as soon as possible.
I would say its a bad radiator are you sure its tranny fluid and not motor oil, in which case you could have a blown head gasket? **correct answer** there should be a transmission cooler that allows transmission fluid to flow through your rad at some point, these lines, when they break, will let transmission fluid into your rad, it also lets coolant into the transmission, which can destroy your transmission.