I put in the radiator and I don't know which one is the transmission line was one of the online

My vehicle has got automatic transmission and, when driving to a hilly place with the air conditioning on, it comes a moment when the car starts jerking until it chokes and stops working. I need to leave it off for around 20 minutes and it then keeps working as if nothing had happened. One of the worst things is that it does not consume coolant, the engine temperature does not raise and the check engine light does not turn on either. Might it be a sensor that is failing? This has occurred to me even when injectors were just cleaned, it had new spark plugs and had just been tuned up.