Mine ran no problem with the viscous fan gone as well. I only noticed it when the bearings in the aux fan seized up. It then started getting dangerously hot when you'd drive through town. No idea how long the viscous fan was gone for but the car was maybe 17 years old at that stage with over 100,000 miles on it. I replaced the viscous coupling with a new one but many people just get rid of it. Robs too much hp

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