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Vandura Fan Viscous Coupling Keith Crawford 8-23-02  
I recently replaced the fan viscous coupling on my 1983 Vandura 3500 after it went to direct drive at 60 mph and made me think the transmission had failed. The new fan behaves differently from the old one. The fan operates at high speed until approximately 50 mph, then the coupling starts slipping and fan noise reduces. If speed is increased beyond approximately 59 mph the fan starts to operate at high speed again and does so until vehicle speed is reduced to below 45 mph and then increased to above 50 mph when the cycle repeats itself. This behaviour doesn't seem to have any relationship to indicated coolant temperature. Is this behaviour normal or is the coupling or thermostat defective?
Re: Vandura Fan Viscous Coupling Joe 8-24-02  
This is not normal. You probably have a defective part. Is this an aftermarket part? I always try to use genuine OEM fan parts because of problems like yours.
Re: Vandura Fan Viscous Coupling Keith Crawford 9-12-02  
Joe: I took your advice, went to a GMC dealer and had an AC Delco fan clutch installed and the problem is solved. Thanks again.
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