My nice thick Bentley manual for the 240 has apparently become politically correct as all it has to say about the A/C system is that one should see a professional.

I would like to do as much of the diagnosis of the non-working A/C on our 1993 240 myself as possible. I'm a very experienced DIY mechanic and I do have a simple A/C pressure gauge, DVM, etc.

So far I have fixed the problem of the blue indicator light not coming on, by replacing the bulb :(. Now the blue light comes on when I engage the A/C switch, but the compressor clutch does not kick in. The diagrams say fuse 8 drives the A/C circuit and fuse 8 is fine. The other things on fuse 8 also work. It seems to me that there must be other protection in the circuit somewhere.

Perhaps someone can point me to a good how-to diagnostics write-up on the 'net somewhere???? Please :) .


TIA for any help!
John