There is no cooling off period when it comes to buying a car.  If you want to get out of a car purchase, the only way is to prove the car dealer committed fraud in the sale of the purchase.  This is called a fradulently induced contract, it does not matter if it was sold AS IS.  If auto fraud induced you to buy the car, then you can cancel the deal and get your money back.  If you feel you have been lied to during the process of buying your car and the car dealer committed auto fraud, please contact us at The Consumer Law Group.