Air Conditioner problems of the 1997 Ford Contour

The contact owns a 1997 Ford Contour. The contact stated the vehicle repeatedly decelerates and accelerates without warrant. When the air conditioner was being operated, the vehicle would begin to shake violently. It would also take an unusually long time for the air conditioner to engage and would blow only hot air. Neither the dealer nor the manufacturer was contacted. The vehicle was not diagnosed or repaired. The failure mileage was 91,000 and the current mileage was 92,000.