Have had my 350 SDL for about 2.5 years ... has always cooled well. Noticed recently that it is cycling more in and out of cooling ... I figured was due to natural loss of R-12 ... I understand this can happen from 0.1 to 0.25 per year in even well sealed systems on cars.

So, I put on low side hose to put a can of R-12 in ... I ended up with about 38 inches on the low side after starting at about 30. Air is a bit colder, but more importantly, the cycling has been signficantly reduced.

As you can probably tell, it has been many years since I worked on auto a/c systems ... did I do this right? Was my diagnosis correct re the loss of coolant causing the cycling in the absence of other problems?

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg