The temperature gauge does not move until well after the fan is full on. On mine the gauge moves nearly to the top at 108 degrees and the fan starts increasing speed from about 100 degrees or a bit less. You need a GAP 11D to monitor the actual temperatures to see what is happening. It also tells you the fan speed which you can see starts to increase as the temperature rises.
You don't hear the gradual increase in fan speed and only really hear it when it is fully locked on, which means that the coolant (and transmission) temperatures are pretty high so you need to back off and preferably change down to get the fan revs up. If it keeps rising after the fan is locked on the temp gauge will go the top in two steps. It stays on normal until then.
Bob
2010 D4 3.0TDV6 SE, ediff, LLAMS, 5 x GOE wheels, LT285/60R18 BFG K02's, GOE Compressor Guard, LR Tank, Mitch Hitch, ECB Bull Bar, Kaymar Rear Bar, Traxide, Safari Snorkel.
2019 Discovery 5 SD6 SE, 20 inch wheels, 275/55R20 Nitto Grappler G2 tyres
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