Transmission cooler line leak
I was wondering if someone might have advice on how to solve my problem. I have a 1998 Pontiac Sunfire GT and I replaced the transmission cooler lines today due to a leak at one of the rubber to steel connections. My problem now is that the flared end with the threaded connector at the rad is leaking. I tightened it very well but not the point of over doing it and it still leaks, should I be putting something on the threads before threading it on??
Thanks on advance,