89 XJ erratic temp.
 

SO I recently went through the captive bottle-cap cap-bottle tango
several times with many over-heatings until I got a Cap-bottle combo
that actually worked. I tightened all the hoses and I now operate okay
EXCEPT when I first start the temp gets all the way up-to @ 230-240 at
which point it drops to @180 then stays at 200-210 whilst in motion.
When I come to a stop the temp climbs slowly to 220 but never gets any
higher then drops as before when in motion again. Before this it used
to be always be 210 regardless of what I was doing... I need to get a
smog and I'm worried about the high temp, does anyone have any
experience or thoughts on this, thanks.

Steve