The Sacramento heat is just around the corner and I just discovered that my A/C isn't working in my 1998 c280 - the A/C blows only outside air temperature. My unqualified guess is the compressor isn't engaging. I've ready a bunch of posts, but I'm not sure what my next step is.

Using the information in this post I've used the A/C Diagnostic display to gather data.

Reading the PBU codes I get: d1 *A (or dl A)

And here are the "REST" Button results (I took these results with the engine on):
1 94*F
2 92
3 80
5 91
6 19 5
7 26*7
8 174
9 35*F
10 580
20 10*0
21 060
22 000
23 000
24 13.8
40 03
41 03
42 02
43 6-C
50 84*F
51 LO
52 37*F
54 OFF

What does "d1 A" mean? Does "000" for 22 mean the compressor is not engaging?

Any help is greatly appreciated…