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The aux fan is controlled by the engine computer, and is only turned on when needed. It can operate for just coolant cooling and/or for ac, but only when the DME see's it needed. If your aux fan never comes on it is probably bad, but it is hard to confirm without BMW GT1 diagnosis. If after a long drive when the vehicle is at full operating temperature with the ac on max it doesn't come on after sitting at idle a minute or two I'd think it may be bad...
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X5 pics
RIP 4.6is.....
2003 4.6is
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11-18-2009, 08:37 PM
Hybrid Mode
