This week on Car Talk, does a car have a soul? That's the auto-philosophical conundrum underpinning the engine transplant Jeff's Isuzu needs. And if a car does have a soul... where does it live, anyway? In the engine, the gas tank... or maybe the fuzzy dice? Meanwhile, Andy's Jeep overheated in the desert, and since he had no water, he used the only fluid he had on him to top off the radiator. Yep, that one. Which leads to his question for our hosts: just what are the corrosive effects of a pint of urine? Elsewhere, Mary's Camry is quacking, Diane's Thunderbird is fish-tailing, and Helena and her husband just picked up a '66 Rambler that's perfect - except for the fact that it can only go in reverse. All this and lots more, this week on Car Talk.