Can I get your opinion on this, I'm not sure if I have a heating issue or just a "hit and miss" gauge.
I've just put a lower mileage second hand engine in my XJ. The old one used to always sit just around 100, but I regularly got low engine temp codes. The new engine sat between 100 and 3/4 but still got low engine temp codes, so I swapped the 82* t/stat for a 92* and now the gauge sits right on 3/4 but no more low temp codes.
It has 2 coolant temp sensors so the gauge is fed from the rear sensor and the PCU from the front.
My TJ always sits on 100 or just below/above. I took it for a long drive today and then measured the temp on the block near where the rear sensor would be, the top heater hose and t/stat housing and the numbers match the XJ almost exactly.
So could the difference in gauge reading just be the difference between the t/stat sensor in the TJ and the rear sensor in the XJ or is it more likely the gauge just isn't that accurate?
The XJ has never shown any other signs of overheating and has a good quality after market radiator and is maintained well and sits around 3/4 (112.5*) regardless of weather, accent or decent, speed etc.
Is it possible to connect the gauge to the t/stat housing sensor and see if it matches the TJ then?
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