I'm chasing an increase in average temps on the 3.0i.

Its going 95-96c average when it used to be 92-93c.

I just drove the 4.6is and the pusher fan is noticeable when it goes to high speed, and temps drop.

I notice that on the 3.0i the pusher fan doesnt go to high speed. It turns on when the AC is on but at low speed only, and most all of the time it's off.

Checked fan via INPA and it goes to high speed when actuated.

No errors stored.

I know the basics in that the fan is PWM and speed is controlled via DME. Any tips on troubleshooting this?

Resolved: Fan activates to cool coolant at 95 degs C, at the radiator outlet. Ktemp is different (at the cyl head) so cannot be used as a reference for fan activation.

Radiator outlet temps can be checked via INPA.

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04 X5 3.0i auto
03 X5 4.6is