maxbraketorque
NAXJA Forum User
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How is it that a 195F thermostat causes an XJ to run at 210F? I've now used a 180F thermostat, and OBD-II reports 195.8F after warmup. I find it puzzling that the reported running temperature is consistently 15F higher than the tstat set point. I've sent a lot of time logging engine temp on my other hobby car (not a Jeep) that has a 180F thermostat, and the logged temperature is almost always 180F.
I wonder a bit whether the temperature calibration is slightly off, but that seems pretty hard to believe. At this point, I'm guessing that although the coolant temp sensor is very close to the thermostat, it is not experiencing the full flow of water going through the tstat, and in fact runs a bit warmer. I need to do some measurements with my IR gun.
I wonder a bit whether the temperature calibration is slightly off, but that seems pretty hard to believe. At this point, I'm guessing that although the coolant temp sensor is very close to the thermostat, it is not experiencing the full flow of water going through the tstat, and in fact runs a bit warmer. I need to do some measurements with my IR gun.