If hot air is coming out of the vents you need to replace the sensor or find a way to measure the coolant temp. If the t-stat is working properly the fan will have no control over coolant temp in cold weather. The t-stat will simply close to bring coolant temps up. Also, the poor gas milage could be due to the fact the ECU thinks the engine is running cold and adjusting the air/fuel mix I believe. Discostew might be better able to address that.That’s correct HasBeen, heat has been hot and consistent throughout all this. Had this thing well bled before replacing the t stat and believe I’ve got it well bled after replacing (and losing very little coolant).
Unplugged the electrical to the fan clutch, went for a drive and little change in temps. Fan was quieter. Did manage to get it up to and over 190 but settled around 190. Plugged back in later and temps were the same though the fan seemed to be running less aggressively when re-plugged back in. So a little better but seems lower than it should be
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