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1998 Cherokee 4L jumps from 210 to 260 very fast
After I installed a new radiator in my 1998 Cherokee 4L I blew the head.
It sat up for about 10 months. I installed a rebuilt head, changed out the thermostat and radiator cap, and had the radiator flushed out.
The engine runs for awhile at 210 or just above it for a few miles and then sky rockets up to 260. I noticed that all of the hoses have very high pressures and almost immediately after cranking the engine that antifreeze is pushed into the overflow bottle.
What could possibly cause this to happen?
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