Why would the temperature of the air blowing on the radiator now impact how well the system can cool the coolant and the engine? I might agree that a difference of 20 or 30 degree in the air temp might not make a difference, if that is what you meant.

So where does this leave me? Poor flow for some reason?

What temperature should the engine be? I can see if the engine is running hot? It night be because i know I have a crack somewhere in the intake side and I am getting the occasional Lean Bank error code. I also have a leak in my valve cover gasket.

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2003 X5 3.0i Silver (build 07/03)
2006 X5 3.0i Blue
1977 Ferrari 308 GTB
1994 Ferrari 348TS Speciale #14/15
1989 Ferrari Testarossa