I thought I could survive without A/C in the new '83 300DT, as I had with my previous primary car, a '70 BMW 2002, but knowing that it's going to be hovering around the low tons until September (108F today), combined with a dark blue interior, and a total lack of shade in the middle of the day, I've committed to getting the A/C working. While I've been an amateur DIY mechanic for years, working on most everything barring opening the engine further than valve cover(s), this is my first Benz, my first diesel, my first post '76, and my first time working with A/C.

I was pleasantly surprised upon meeting the car to find that the climate control system controls (ahem) in the center console operate correctly, albiet without cold and without opening the center vents. I can hear the blower operating, and can feel air thru the side vents.

I called the premier local A/C garage, according to the phone book, who quoted me around $250 to test for leaks and $650 to fill the system with R12, which requires and includes the leak test. Is this as high as it sounds, or is it actually a typical price range for the job? And if it is typical pricing, is one getting screwed by paying it? Is the difficulty of the job that high? Should I just call around some more?

In any case, if at all possible I'd really like to do it myself. I've been nosing around Aircondition.Com, which is very general, and have re-read Diesel Giant's article multiple times, but I'm stuck as I haven't access to the equipment mentioned ("A/C recycle charge machine"). What can I do to diagnose the state of the system on my own? How do I test for leaks and test if the compressor is working properly? What tools do I need to do the job myself?

A simple step-by-step detailing the complete process of a total flush and recharge would be a total godsend. I'll take photos during my process and we'll have a definitive W123 guide!

Any help is much appreciated. Thanks!