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Unread 06-06-2013, 05:35 PM   #1
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Join Date: Jan 2013
Posts: 7
Temperature Issue

Hi, hoping you guys can help me out again. I have a 98, and the temperature gauge reads normal operating temperature, 210 after it had enough time to warm up after driving. But sometimes after driving a little while at 210, the gauge will drop to about 140ish and stay there. The engine seems to not change with the gauge, the top radiator hose seemed hot as one would expect it to be during the incident. Verified the temperature the gauge was reading at idle with a scanner, it seemed to match when things were working properly. The engine does have the proper amount of coolant. Any ideas would be appreciated, thanks in advance.

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Unread 06-06-2013, 05:40 PM   #2
It's the crank sensor!
tjwalker's Avatar
1999 XJ Cherokee 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,431
The primary suspect is the "coolant temperature sensor". It is located on the top of the thermostat housing. It is a very common failure on the 4.0

I suggest you purchase a Mopar sensor direct from Jeep for the best accuracy/reliability/mating with your factory coolant temperature gauge.
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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Unread 06-06-2013, 05:44 PM   #3
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Thank you so much! It was bothering me quite a while, nice to finally have an answer.
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