Originally Posted by trader4

Has anyone that wants to increase HP by getting rid of the primary engine cooling fan stopped to think about the HP involved? You have a 225HP engine. How many HP do you think it takes to run that fan? A furnace blower motor is only 1/3 - 1/2 HP. That engine fan is more like a fractional HP window fan motor in terms of energy consumption. If you think youi're going to notice some difference from what is probably less than 1/8HP difference, you're kidding yourself. If you think you notice it, it's like someone taking a placebo energy pill and thinking they suddenly are all pepped up. And then you're making up for the airflow with an electric fan? So, the alternator is loading the engine, making electricity, then driving the motor, and this is a good thing compared to a direct drive fan?

You BMW guys are a strange bunch. You buy these cars because of the alleged great Geman engineering. Then you tear it apart and try to re-invent the wheel. Two of the aux electric fans have failed in the X5 here so far. The original mechanical fan, it's still running.....