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A intermittent short to ground in the wiring or the motor is drawing excessive amperage.
 

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One of two things:

Intermittent short

Fan drawing too much current

The wiring is simple: It goes from the fuse box over the passenger side inner fender, to the fans. The primary fan wire is light blue.
 

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how can you tell if the motor is drawing excessive amperage??
Put in a new fuse, turn it on and then feel the wire to see if it gets hot. Be careful, it could get real hot.

Or, turn the fan by hand to see if it has a lot of resistance.
 

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Replace the fan motors!

I had several nightmare overheating rides because the fans had overheated the relay sockets resulting in poor fan function. Even after replacing the fan motors, the fan speed was low due to the relay sockets being cooked and 'yawned' out.

Fan motors at Autozone seemed to work fine. They're like $40.

The relay harness upgrade kit from Innovative Wiring was ~$120...

-kp
 
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