Stuff

$criteria = array('Car.name' => 'LIKE %'.$_SESSION['car_name'].'%');
// or try using the session class to manage your session vars
//$criteria = array('Car.name' => 'LIKE %'.$this->Session->read('car_name').'%');
$cars = $this->Car->findAll($criteria, NULL, $order, $limit, $page);