1994 jeep cherokee overheating while ideling

[rjmidbon]

My 1994 jeep cherokee 4.0L inline 6 at idle for ten minutes reaches 260F I have a new radiator, water pump, thermostat, heater core valve, and new valve cover Gasket, I have a new heater core and oil pump but have not put them in yet. I do not have oil in my radiator fluid nor do I have water on my oil dip stick so I concluded that it is not a head Gasket, but the little electric fan does not stay on when the vehicle reaches this temp nor does the radiator feel hot I would think that the radiator would feel hot since water boils at 212F. I just have water circulating through the system now for I wanted to make sure I had no leaks in the system, did not want to waste money on Antifreeze/Coolant until I checked everything that is new first, will remove bottom hose when I find out what is causing this excessive heat in the engine. Anyone with feed back on this would be greatly appreciated

 

[kingmega]

U don't have to have water in the oil to have a bad head gasket try putting the fan on a toggle switch so u can run it when u want maybe change out the temp sen. To see if the temp gauge is right or not at 260 it should be boiling

 

[kreatos909]

It is your head gasket. I recently did mine and it was bad. But no over heating though. Or your clutch fan is shot ..

 

[SteelHeadz]

If and when you pull the cylinder head off, you might as well take it to a machine shop and get the head checked for cracks and if there's no crack, have it resurfaced before you put it back together.

 

[1sickXJ]

I would check to make sure your clutch fan in engaging and the electric one should kick on with either a/c on or when temp gets around 217. If it's not the fan could be bad or the temp sensor could be bad. You could tap into the electric fan w/ a relay and add a switch to override. should work in tandem with the factory set-up. Another option is to upgrade your current electric to the newer 97+ (maybe 96+) fan, better blade design, higher CFM. Direct drop in - might have to cut the old connector off and tie into the new one to make them match.
Also is your radiator cap good? Might want to pick up a higher pressure rating - this will help raise the boiling point of the coolant