I have the VERY exact issue. I'm a 1998 Cherokee 4.0L with AW4. I've flushed the system, replaced radiator cap, mechanical fan clutch, electric fan (mine was bad and locked up anyway) and thermostat.
Everything starts and runs fine. Jeeps comes up to operating temp in about 5 minutes or so and continues to run fine. After driving for about 10 or so minutes, ALL OF A SUDDEN the gauge spikes up to 250 and the "Check Gauges" light comes on. I pullover and stop, open the hood and the electric fan is running like it should, I'm not overheating, but probably close.
Sound familiar? I hope to test and see if it only happens with the A/C on. I think it might be a bad A/C compressor or clutch, that is loading the system more than it should?
Anyone have any thoughts?
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