Bottom driver's side has sprung a leak. Got towed home last night and put the Egg up on ramps this morning. Noticed a small capped off port on the lower driver's side of the radiator, right above what looks to be a return line, and some of the EGR lines (maybe). I can't find anything in any diagram in ETKA to tell me what it was possibly used for (Also cant find the right damn diagram FWIW...). I am now assuming this is an aftermarket radiator that someone just capped off, but wanted to see if anyone had any thoughts/input before I just capped it off again. Not hurting anything now, and it's been flawless for a month. Just wanted to make sure the previous owner didn't bypass something in a hurry. EDIT Not sure why the pics decided to re-orient themselves sideways, but you can see the cap I'm referring to regardless.