My aux fan fuse (30 amp) has blown once. I replaced it with another 30 amp fuse and will monitor it closely. If it repeats, I may try the 40 amp fuse and then do the harness change. The MB dealer is not very helpful since I purchased it new from another dealer. What did the harness cost? Seems like a fairly easy DITY job.

My 99 E300 has a totally different setup, a variable compressor. It also has a self diagnosis capability that I wish the ML had. Allows you to read the high pressure side and evap temp, etc from your instrument panel. Great info for DITY guys like you and I.

Good luck with the 134a conversion on the E300. Living in FL, I haven't had much luck with conversions. They work well until you do some city driving and then they really can't keep up with the FL heat. Did both to my Saab and a 83 300D I owned and went back to R12. Luckily, I have a 609 certification and did it myself. The R12 is about $25/lb these days if you shop at ebay.

Good luck and thanks for the excellent photos on the harness change.

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99 E300 133K
98 ML320 99K
87 Saab 900 Turbo Conv 123K