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Discussion Starter · #1 ·
I have a 2008 Rubicon Unlimited, 108,000 miles.

While driving last night, out of no where, the red lightning bolt and check engine light came on (code unknown). I also lost all indications of temperature, the needle dropped below the "C". I also seemed to lose some heat in the cabin. Also, when I got off of the highway and was stopped at the light, the fan was running and would not turn off. There was no indication of engine performance change.

Background: This weekend I changed out the radiator, both hoses, and the thermostat. It ran fine on Sunday, Monday, and the first part of Tuesday. Could this be the throttle body sensor? When I was changing the thermostat and I unhooked the sensor, one of the hold back clips on one of the sides broke. It still had the clip on the one side, so it seemed to hold the sensor in place.

Thoughts?
Thank you!
 

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Discussion Starter · #2 ·
Update:
I just drove to Autozone and used their code reader and got code P2181 (Cooling System Performance) and secondary DTC P0128 (Thermostat Rationality). While I was there I got another thermostat just in case. Sucks, cause I just put in a new MOTORAD thermostat not even a week ago.
Once I left there, the red lightning bolt did not come back on, but the engine light stayed on. The needle on the temp gage rose a little bit, then dropped, then rose, then dropped. I got a little heat. When I got to the house and parked, the temp needle rose again a little and then started getting heat. I drove around the block and the needle dropped again. The needle never got above the 1/4 mark. Weird.
 

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It appears you have a lot of air in the system. Check what the manuals say about bleeding the air out.
 

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had same issue with my jeep and once i read the code P0118 i swapped out the temperature sensor at the front of the engine and no longer does the lightning bolt come on. my symptoms where early light with check engine and loss of temp gauge. Nothing to do with ETC but was temp sending unit
 
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