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Originally Posted by RMB_BMW323i  I have been having the same issue. "Loud Air sound" I just bought a 99 323i and noticed it for the past 2 weeks...What i have found out is it does come from the cooling fans . It gets loud on my car after about 15 -20 min driving with the AC turned on on hot days. So I started leaving the AC off and I rarely hear it now.
The sound come on after I come to a stop then starts for a few seconds then go's away when the car gets above 35 to 40 mph. Does yours do this too????? |
i believe what you are hearing is the auxiliary fan stepping up it's RPM's to cope with the increased load of your engine. It's all computer controlled based the engine temperature, so as ZIBBY sez: "no worries" ;-)
