When my 2005 X5 4.4 sits for hours and engine is cold, the AC doesn't blow cold for the first 5+ minutes. The clutch is engaged-compressor is turning, but the radiator fan does not come on when engine is cold (no auxiliary fan on this car, just main radiator fan). Once the engine warms up and the fan comes on, the AC begins to blow cold. I'm assuming the fan should come on when AC is on. Any suggestions?