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-Tom
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Just the opposite. The vicscous IS the Main fan and it moves air even when not locked up.
The aux fans are just that... Auxilary Fans..they only come ON when there is a Higher than normal Thermal Heat Load. If the main viscous is operating as designed , there is no need for aux fan except when the system is burdened with extreme heat load or a/c high pressure at condenser .
If all systems are normal and ambient temp do not present a high load , the aux fans will never come on bc they are not being called for.
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A Dalton
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