300E air conditioning

[Walter Lake]

The A/C compressor on my 91 300E (Model 124-030) isn't running. Have checked just about everything, including that the refrigerant charge. The suspected culprit is the A/C Compressor Control Unit (N6), but I can't locate it. My parts locator shows it behind the battery near the ABS Control Unit, but my car doesn't look like the picture on the Mercedes CD. Can someone please give me a clue where to look?

Thanks,

Walt Lake