Hey guys I want to check the transmission cooler line check valve as i think it might be stuck, as for the 1st time yesterday the OD/off light came on and wouldnt go off and then a little while later (almost home) the trans temp come on, got home did some reading on here about the check valve and I think its stuck as my cooler lines were not hot. The tranny fluid and filter, sensors, solenoids, were all changed about a month ago by me, and the bands were adjusted. Anyways I think the tranny is ok as the fluid from yesterday still looks red and not burnt, and shifted fine when the lights on as I wasnt far from home. But anyways I have a 2000 ram 5.9 with tow package so i have the factory cooler between the rad and cond. and like I said the lines were not hot so i think the check valve is the issue, my question is on the pic i included is #1 pointing to the check valve correct and it runs into the bottom of the rad at #2, so to check the valve I unscrew the rubber line from the metal hard line going to the tranny and then do I unscrew the thread part going into the rad or do i disconnect the line from the screwed part in the rad? how do I do that i see no way to disconnect it. and then when I do disconect it will fluid poor out of the rad, if so what fluid will it be.. coolant?? or atf4? Thanks guys just trying to get info before i get fluid all over the ground.