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Re: electric fan startup noise
Could well be a totally different thing, but I had to replace a fan motor because the bearings were apparently shot. I was alerted to this by a faint rumble I could hear for just a second or two after switching off the car. Point being, 20 year old electric motors do wear out. Spin and wiggle the fan blades and see if there's any play in or noise from the motor shaft. Also look for obvious signs of arcing on the motors and wiring. The fan assemblies are super-simple to remove.
dcb
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