Quote:
Originally Posted by Arthur Dalton
"Sir, Yes Sir..This is a Call Center , Sir "..May we fix your Mercedes,Sir?"
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15 years later, your legendary tests are helping me diagnose my Aux fan issues, so I tip my hat to you kind sir! I hope you're in the best of health!
I'm actually surprised that people had these issues that long ago, mine's only developing these corroded contact related problems in 2023 (or maybe I'm only just beginning to look properly).
Anyhoo, my '91 300E 4matic (converted to 2wd) sedan with Automatic Climate Control and dual fans has high-side fan issues. My question is, did this year model have 2 relays or one? I noticed you mentioned there are two systems at play, an earlier version with one relay (for both low and high side) and a later version with 2 relays (separate for low and high side). I couldn't find any reference pics so I pulled the relays and took some pics. If anyone could identify what they see, that'd be great! (Yellow 40A relay goes into slot A in the relay box, Silver relay 20A? goes into slot B).