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#11
05-06-2025, 06:42 PM
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brushless AUX fan (DME controlled) vs. brushed aftermarket fan (w/manual control)
I think that all the replacement fans for our X5's are brushless; the DME regulates fan operation via PWM signals that the brushless fans need. Brushed fans just need a potentiometer to change speeds.
Brushless fan motors are also thinner, which helps them fit in tighter spots like between the grille and radiator; I use an aftermarket brushed fan (replacing the stock viscous fan in my '01 X5), and it is thicker in cross-section than the AUX fan. I use an aftermarket (Chinesium) motor speed controller to adjust fan speed on the high-cfm fan I installed. It can really make a lot of uneccessary noise (and draw more amps than needed) when idling at stoplights or when the airflow thru the radiator doesn't need that much fan speed, so I tune the speed down accordingly. The DME does the same for the (brushless) AUX fan, automatically.
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01 BMW X5 E53,3.0i-5L40E, 7/13/01 topas-blau,Leder-grau,"resto-project car" Here: 14 Lexus ES350,3.5L-U660E 09 HHR Panel,2.2L-4T45E 04 Chevy 2500HD,6.0L-4L80E 98 GMC Sierra 1500,5.7L-4L60E Gone: 66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake 08 Cobalt Coupe,2.2L-4T45E 69 & 75 C10s,350c.i.-TH350 86 S10,2.8L-700R4 73 Volvo 142,2.0L-MT4 72 & 73 VW SuperBeetles,1.6l-MT4 64 VW,1.2l-MT4 67 Dodge Monaco 500 2dr ht.,383c.i.-A727 56 Chevy 210 4dr,265c.i.-PGlide Last edited by workingonit; 05-07-2025 at 11:16 AM. 
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