2005 BMW X5 Q&A

2005 BMW X5 Question: Engine temp takes a long while to reach operating temp

My engine temp was taking along time to warm up so had the thermostat replaced, but still no luck, it will still take ove 30-40 mins of solid driving to reach 1/2 way,then if I happen to put the cabin fans on on hot you can watch the engine thermostat drop to around 1/4, you can feel the heat difference increasing the faster you drive and drop off if I stop, any ideas?? Are these a linked problem or separate? -
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