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Under the lift arms
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Leaking or stuck open thermostat
Low engine coolant level
Insufficient warm up time
Faulty engine coolant temperature sensor
Engine coolant temperature sensor harness is open or shorted
Engine coolant temperature sensor circuit poor electrical connection

bmw scan tool will have something called map cooling test.. which you could use to figure out if the sensor is bad or if the stat is stuck


Im gonna guess bad wireing or sensor
 
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