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Wiring diagram for single fan M59
Thanks Guys ... Yep my van has aircon and I have already replaced the coolant sensor and it makes no difference but it does send data to the gauge and presumably the ECU ... I am going to test the low speed fan manually over the weekend to make sure it's working but I think seriously that the engine simply isnt getting up to fan "kickin" temperature ..I let the gauge run up to one mark before the red so that should be at least 110 or 120 and should kick in the fast fan or even initiate a stop BUT if you feel the engine it's nowhere near overheated (I didn't have my borrowed IR thermometer with me) so I really think that the temps are actually normal and the gauge is just way, way out !! (I'm assuming the sensor will tell the ECU when it gets to say 97 or 110 and not the gauge!! I haven't looked at Diagbox software yet as I sold my laptop ages ago ... Someone said that you can recalibrate the fuel and temp gauges using Diabox ... I'll up my findings at the weekend!! Someone else also told me the fan has a "midspeed" that the pressure on the aircon controls coming in at 10bar ..if the fan doesn't run then the aircon stops and mine works well!!! More food for thought!!!
The text document I attached to the other post shows what you can change on DiagBox. Pretty useful for all the guys who have it. Worth a download.
My Van: 2012 B9 1.6 HDi Enterprise

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