Pontiac Grand Prix 2005 the car has an antifreeze leak. I have been unable to determine where it is coming from. The air conditioner works but the heater does not. The car has about 150 K miles on it. When I bought it some years ago the automatic transmission occasionally gives a jerk when quickly accelerating from a dead stop. In the 70K miles I drove it, it never got any worse. The tires are OK, not new, but have some mileage left. The engine is a 6 cylinder. I got pretty good gas mileage with it. I'm not sure what it is worth, but I will not accept any offer less than $900 for now. If the car doesn't sell in a couple weeks, I will lower the price.