I went to use my airconditioning in my 400E earlier this year and it wouldn't get cold. I checked the fuse in the main fuse box and it is fine, but I noticed on some other threads on this forum that at least a few other models have a secondary fuse for the airconditioning unit. I engaged and disengaged the compressor with the dashboard controls but didn't hear noise from the compressor to indicate that it was working (I've had a couple of other cars with airconditioning units and noticed the compressor made a noise when they engaged even though one of the cars had a freon leak and wouldn't produce any coldness). My manual doesn't mention an extra fuse, so I was wondering if anyone knows if there is a secondary fuse, and, if there is, where to find it.

Thanks