My 94 xj seems to be over heating easily lately. Its not horrible but its above the 210 mark and it will cool itself off like it should. I replaced the water pump and thermostat about a month ago but still does slights over heat....is something else wrong like the radiator itself??

 

when does this occur

 

It hotter weather in my area(central Ohio) and after it warms up it will be fine sometimes and them ill come to a stop light it will heat up to about 255 then ill start going and it will drop to 150 ish

 

try the sensor, i had a camaro that did that. also mine easily overheats after im in muddy water since it gets in the fins and the fans cant pull air through...

 

If your sensor is ok it's odd that it will go from 255 down to 150. Are you running a 205 thermostat or what? It should be rock steady at that. Fan working?

 

sounds like no thermostat and clutch fan should be checked

 

Turns out my thermostat was bad I put it in boiling water and it never heated up so it must have been faulty from the factory