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1992 968 Cooling fan operation

Electrical

Vehicle Information: Model(924/944/968): 968; Year: 1992; Body Type: Cabriolet; Total Mileage: 75,000;

The cooling fans keep coming on and off when the car in not running and is cold. They would turn on for less than a minute. I have already replaced the fan thermo switch on the radiator. I was going to replace the fan relay, but wanted to make sure this is the problem before I buy a $150 relay and still might have the same problem. What else could be causing the problem?

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