How To Collect Money For Car Sale I Sold My Car And Took A Personal Check. The Buyer Stopped Payment On The Check. What Can I Do?

I sold my car and took a personal check. The buyer stopped payment on the check. What can I do? - how to collect money for car sale

I sold my 2002 Pontiac Grand Am GT last Friday. I let the buyer know he had to save a title and takes a bit of oil. What are the negative was that he knew about the car.
I met the buyer saw the tube so wanted to buy, and she had enough confidence vein, he took his personal check. Four days later, the heating is switched on the light and has taken the car into the garage. They say it is the oil in the radiator and the engine may explode at any time. This is all new to me. Then stop the payment on the check and told me to the car.
I have a contract he signed when he sold the vehicle.
What are the rights that I have to bring money for the car?