@wpoll, I think the diesels are completely different for that.
@andrewwynn Yes, it seems the aux fan only comes on with the coolant hose sensor.
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The car set an SES code for shorted coolant temp sensor it thought the reading was erroneous it seems.
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The sensor would be almost shorted at that high of a temp.
When I first checked into it I had the DME side (voltage) pulled down all the way to (simulate) 142 C and neither fan or coolant light came on, when I snipped the gauge side though the light did come on. I think it only will come on with DME temp if it thinks the gauge side has failed so that is what I am going to check into next.