Thanks Starman. Yea still have one yeat warranty, but me being me I always try to be more knowledgeable than the shop if possible just to not get bamboozeled. I have no check engine light on but when reading it I get the 12 and then 59. Never had that 59. Looks like a 5/16" plug(or metric) driver side a few inches above pan and toward front of pan. Code is open circuit. Is this something I should live with? Think I need to know what that fluid is doing after running thru cooler Appreciate it.