It's been running cold - have not seen the needle move out of the cold
section yet. Not that I've been driving it hard, yet, just around town. But it has certainly had a chance to warm up fully. I assumed either the wrong thermostat, a failed (open) thermostat or no thermostat. So I picked up a replacement and pulled the thermostat housing today. I am a little confused by what I found. The thermostat had two little brass clips on it that seem to have locked the thermostat open. I pried at them and it popped closed. Is this something that someone added to the thermostat to keep it open? If yes, why keep the thermostat in at all...AFAICT it would never close.
While I was working on the thermostat, I noticed something else amiss. This picture is looking down into a channel between the right side of the radiator (above, silver) and the overflow tank (below, white). That is the hose from the radiator cap to the overflow tank. Looks to be kinked at the bottom before it curves back up to the bottom of the overflow tank. One more thing to add to my list...
77 Wagoneer and 97 TJ.