2000 Cherokee 144 k on the clock got a brand new radiator about 6 months ago everything was fine then all of a sudden the temp starts spiking everyday and there's no coolant in the tank I looked at the hoses and spot a little leak I tried duct taping it and for about 2 hours the temp is fine then the coolant tank is empty and the temp spikes until I fill it again should I just replace the hose?

 

If it's leaking a bottle of coolant a day? Yes, replace the hose. I doubt duct tape holds up well to 210+ degree fluid...

 

Yes its leaking a bottle of coolant a day and the bottle of coolant doesn't even last the whole day zipties worked for a while but now it just doesn't wanna hold any coolant

 

Also for every 1 pound of pressure on a system it RAISES the boiling point 3 degrees.

So for a system under 10lbs your boiling point is raised 30 degrees.

So if the hose leaks the pressure drops lowering the coolant boiling point and waalaa you overheat with a 2000 XJ that has a known flawed casting in the head.

 

What hose? Is it leaking from one of the ends?

 

The hose from the coolant tank to the radiator it has a hole right before it feeds to the top of the radiator.

 

fix the hose,have the cooling system pressure checked do the cap also

 

You should be able to cut an inch or two off that hose and still reach the radiator. Don't be surprised if the nipple on the radiator overflow is rotted though.

I had the same problem, turned out it was the nipple. Drilled what was left of it out and used a tap & die to thread a brass nipple in. Haven't lost any coolant since.