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Okay so my understanding is the cooling fan should come on high when the AC is on, but I've been having it come on and run on high while I"m driving without the AC on. If I turn the van off and then back on again the fan does not come back on. I don't think it's related to temperature, the temp needle is right in the middle where I think it should be. Any ideas why this is happening? Promaster 2500 eco diesel 4 cyl.