Low operating temp. - JeepForum.com
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post #1 of 4 Old 09-27-2012, 08:17 PM Thread Starter
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1995 ZJ 
Join Date: Sep 2012
Location: Anchorage
Posts: 182
Low operating temp.

My 95 zj 4.0 always ran at 210 degrees recently the gauge has been on the line below 210 or the next line down. I replaced the thermostat with a napa t-stat no change so I installed a oem t-stat no change. I also replaced radiator cap and the sending unit no change. Water pump is 3-4 months old was recently replaced. i do not have access to infrared thermometer but thats my next step i guess, see what the actual temp is at the t-stat then check the dash gauge but any help or ideas would be appreciated

I did notice when I replaced the radiator cap and went for a short drive it reached 210 but fell back down immediately and noticed today when engine is warming up while sitting in cab at idle when I rev it I can here the flow of water in the dash (hope thats normal) and it does blow hot air

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post #2 of 4 Old 09-27-2012, 09:56 PM
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1995 ZJ 
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Sounds like it might be a gauge calibration issue to me, at least I would like to verify that first so you might try to get a temp reading with another gauge or thermometer first. Really if its not the gauge it would almost have to be the thermostat. The cooling system if working right should have the capacity to make the engine run cooler but its the thermostat that keeps the engine operating temperature normal. I would not suspect anything else at this point.
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post #3 of 4 Old 09-28-2012, 08:42 PM Thread Starter
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1995 ZJ 
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Yeah that is what I was thinking. I'm gonna swap gauges and see what happens I'll post the results. Thank you for the input
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post #4 of 4 Old 10-02-2012, 04:46 PM Thread Starter
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1995 ZJ 
Join Date: Sep 2012
Location: Anchorage
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ok so determined its not the gauge and engine was indeed running at normal temp it was either bad units i had purchased from napa because i purchased one from orielys installed it and getting a 210 reading now. i also cleaned the surface of the head where the nut of the sensor touches the head dont know if that helped "maybe needed a better ground"?.
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