temp spikes

[doubleuj17]

It could be an air pocket in the cooling system,the 4.0's always get an air pocket in the front of the block/head because the motor is tilted back,especially if you have a t-case drop on it and the cooling system was opened up when the waterpump was replaced,i'd try bleeding it with a cooling system funnel on the radiator with some coolant in it and jack the back of the jeep up till the engine is level and run it for abot 15-20 minutes,hold the rpm at about 1500 for a couple minutes.Been dealinwith these 4.0 issues for years at work and always try the easiest and cheapest thing first,hope this helps,good luck.

[Trailer Ray]

It could be an air pocket in the cooling system,the 4.0's always get an air pocket in the front of the block/head because the motor is tilted back,especially if you have a t-case drop on it and the cooling system was opened up when the waterpump was replaced,i'd try bleeding it with a cooling system funnel on the radiator with some coolant in it and jack the back of the jeep up till the engine is level and run it for abot 15-20 minutes,hold the rpm at about 1500 for a couple minutes.Been dealinwith these 4.0 issues for years at work and always try the easiest and cheapest thing first,hope this helps,good luck.

I already posted up that its all set, but I appreciate the input

[Trailer Ray]

i had this issue will i put all new hoses in cleared my heater core with the garden hose new t stat and a heavy duty fan clutch i also did the hood bum in the rear and it runs at 190 now

My last xj had the hood lift in the rear and hood vents. I have the hood vents on this one and I love them. I think if I didn't have the vents I would lift the back for looks but I didn't feel like fabbing it up. The vents are sexy though.