Any update on this? I just read this post and it’s the same exact scenario I’m going through right now with my 94 loyale. At speed my temp is low to mid (good) but as soon as I stop and idle or drive slowly off idle it starts to get hot, never overheating but too hot. I have a new thermostat, my heater core is sloshing like crazy tho, I’ve tried to burp the cooling system several times and can’t seem to get it all out or deep enough, I recently flushed the core with water, nothing fancy, good flow. I’ve owned it for a yr and bought it for 300 and have put 15000 miles on her but it just recently started overheating after trying to burp the cooling system. Core won’t stop sloshing around corners and temp is getting more random, it used to just run cold alllll the time, no heat, prior to the burp.