I bought my Jeep at the end of last summer and it was having slight issues with going up to the second notch above 210. I changed the thermostat and flushed the system. The problem went away untill i took a two hour drive, then it came back when i would drive for over an hour at a time. When the weather cooled off, it ran perfectly (right below 210). So when the weather is cold it runs great. Now we are starting to get nice weather again, the problem is back. Does anybody have an idea where i should start? I dont have water in the oil, and no leaks.

 

Water pump, fan clutch, radiator......just git 'er done....hot weather's comin'. T-stat only controls MINIMUM coolant temp....the rest of the cooling system along with ambient temp effects max temps.

 

I dont want to start throwing parts at it. Im looking for what is causing the problem

 

Better start throwin' something at it. Good luck.

 

when does it get warm when driving or stoped or going slow in traffic

 

it get warm when im stopped, but will slowly cool back down if i drive a distance again

 

Sounds like a cooling fan. Heats up when you stop. Cools off when you drive. Deff sounds like a cooling. Pull the fan rely and use a paper clip to jump the terminals. If it comes on. Replace rely for 5 bucks. If not start testing the wiring. And the fan its self. Good luck.

 

the electric fan works, It comes on when it starts getting warm

 

Bubble in the cooling system??

 

when its warm spin the mechanical fan it should be tight when spining it if it spins very free replace the fan clutch

 

freegdr- I thought that too, And it feels tight to me but I have no base of comparison. So I read on this or another forum that if it can be stopped while running with a newspaper than it is bad. Tried it and ended up with confetti, so I figuerd it was good

Bones99xj- its a 2000 and from what i understand, they dont need burped. but to be on the safe side I have ran it with radiator cap off and squeezed the top hose to try to get the air out of the system if there was any

 

yea i saw the paper test also when was the last time radiator was flushed

 

is the radiator visualy in good shape no rotted fins ,is air being drawn thru it when at idle see if news paper can be held againts the grill when idleing

 

I flushed it either in Ocober or November. I used the prestone cleaner and ran it for about 20 minutes and did flush a bunch of orange gunk out.

the radiator doesnt look bad but I cant say for sure about a newspaper sticking to the radiator, but will try it tommorrow.

 

did you flush it untill clean water ran out did you flush the block also