Vacuum 101? - Beginner needs help

[77450slowner]

I have a 77 450SL that I suspect has some vacuum problems (heater etc). I've searched the threads in this forum as well as looking at the MB Maintence CD and Haynes Manuals for info on how to trouble shoot vacumm systems. There is lots of info but it seems like you have to pretty knowledgeable on where the parts are located and how to do the tests with tools like Mighty Vac (which I have but ony used for brake bleeding).

What I am looking for is some very basic instruction on the vehicle's vacuum system - what and where are the main vacuum components, how does the vacuum system work, What are the indications of a vacuum problem for various systems, how do you use a Mighty Vac for troubleshooting, etc.

I'd appreciate if anyone could point me to some articles or threads that would be helpful for a beginner in troubleshooting the vacuum system.

Thanks

Mike

77 450SL