2008,130,000 + Radiator leaking where tranny line goes into bottom plastic tank. Ordered new rad.,from pics appears no cap so do I just "burp" from overflow tank as if that was the radiator cap?
Any thoughts on coolant additives?

 

There's a hex bleeder valve on the topside line on the right that I think would be used to burp the system. I think the instructions for adding coolant are on a yellow sticker on the reservoir or near the bleeder. Like the sticker says, don't open either when hot!