The fan must be coming on with it's low speed, then in extreem conditions, it will use the high fan speed. This is probably what you are hearing. Be shure the low speed is working.
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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
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