Examine the socket where the line connects to make sure that the fitting is not cracked. If cracked, it won't seal and you may spend time chasing speak unnecessary.

If cracked, replace cooler or buy a MBZ fitting that replaces the original fitting. Replacing may be cheaper if you buy the tap and drill.

__________________
85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.