This is a point that I think a lot of people are missing: Click and Clack, while being funny, were primarily master troubleshooters. They could digest incomplete descriptions of a problem over the phone from a neophite user and in the span of a phone conversation, usually with no ability to run tests, could work out a plausible root cause and a corrective course of action. The "Stump the Chumps" segment would occasionally follow up with some previous victims/callers, and more often than not they had largely gotten it right.

I'm not sure how much you'll actually learn about cars from listening, but if you pay attention you should be able to learn a whole lot about effective troubleshooting.