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Old 03-03-2014, 09:26 AM   #1
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Running Hot

Firstly, I want to give a shout out to all the forum members. The great information everyone shares on the forum has been indispensable for a shade tree wrench turner such as myself. Thank you all!

Last year the water pump went out on my '93 4.0L, the engine overheated and blew the head gasket. That is when I realized my temp sensor was faulty. After I replaced the sensor, water pump, and fan clutch I noticed the temperature would climb to 210, sit for a few seconds, climb up to 230 and then drop back down to 210. It never got above 230. A few weeks later the radiator sprang a leak, so I replaced it. Still no change in the temperature (continues to run up to 230 and back down to 210). Since then I've replaced the heater hoses, the thermostat housing, flushed the coolant system, and installed a new thermostat (195 degree). Still the same result. Every time I drive it the temperature gets up to 210, sits for a few seconds, and goes up to 230 before cooling back down to 210. The temperature will not sit at 210 longer than a few seconds, and continues to bounce back and forth between 210 and 230 while driving. I've burped the engine several times, but I'm getting concerned there is more to my issue than air in the cooling system.

Any comments, suggestions, or guidance will be most welcomed.

Thanks again to all the forum members! I really enjoy all the great input everyone contributes.

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Old 03-03-2014, 10:54 AM   #2
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It sounds like your thermostat is working, maybe your gauge is off.

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Old 03-03-2014, 11:00 AM   #3
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Originally Posted by 479jeep View Post
It sounds like your thermostat is working, maybe your gauge is off.
X2, if your gauge is correct, maybe your thermostat is opening a little late. On mine when I first start it up mine will climb to around 220 but it has always leveled off at 210 where it stays.
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Old 03-03-2014, 11:02 AM   #4
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Hmm. Could be. I do recall that when my temp sensor was bad the gauge never read above 160, thus I had no clue it was overheating until I was stranded on the side of the highway with a blown head gasket. Perhaps the gauge is faulty. Any tips on testing it?

Thanks a heap for the response!
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Old 03-03-2014, 11:14 AM   #5
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I'm sure you could check the resistance of the gauge or go buy a cheap aftermarket mechanical gauge and hook it up and compare the two.
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