Question about 2001 Saab 9-3

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I have a 2001 saab 9-3 170,000 miles. my car overheated the other day, it ended up being a radiator hose. now the car has a hard time accelerating past 35mph, after about only 5 minutes of driving. eventually doesnt accelerates at all. the engine stays on, but no gears engage. after shuting off the car, and and letting it sit for about a half hour, it starts right up but after driving for a couple minutes, the car starts to deccelerates. what is this? also, the engine fan continues to run even when the car is turned off.

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